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BlinkListAlexa: 3,600Technorati: 63,794
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BlinkSpaces - create a community out of your links, nice browser toolbar, all and all really nice.
A few broken links in places, a bit underdesigned for my taste.
BlogmarksAlexa: 9,000Technorati: 48,331
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Nicely designed, generate a post of your bookmarks for your blog
Seems incomplete compare to other sites. Injects ads. Crashed several times during my tests.
del.icio.usAlexa: 155Technorati: 1,597,818
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Easy to use, intelligent, tons of useful features, not in your face
Not fancy, might not appeal to the main stream.
diigoAlexa: 13,750Technorati: 2,262
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Post to other bookmarking services, supports annotations with sticky notes, flexible blog integration.
A lot of options, might not be easy to learn for everyone, mixes a lot of things together.
Furl Alexa: 2,400Technorati: 126,000
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Has archiving, simple browser add-on, has some additional options associated with the post.
Lacks related items, could use a re-design.
Ma.gnoliaAlexa: 9.400Technorati: 82,800
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Beautiful design, nice implementation of groups, well thought through
Does not look very active, lack of browser add-ons and imports, lacks unique features.
MyWebAlexa: 1 (for Yahoo!)Technorati: 76,000
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Nice look and feel, could work for main stream.
Too many things in the toolbar, falls short of del.icio.us on many features.
ShadowsAlexa: 13,000Technorati: 11,140
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Fairly comprehensive set of features, clean design
Popular is done by tags instead of by links, site is somewhat slow, does not feel as connected as del.icio.us
SimpyAlexa: 14,600Technorati: 35,000
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Instantly view current page history, browser export
Could use UI improvements, no popular links, similar links are not cross users, too many first level menues in Firefox extension
StumbleUpon Alexa: 617Technorati: 33,500
 
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A different approach, that seems to be successful, given the number of users. Nice browser toolbar.
Would be great to have directory and browse related.

Estimating the number of users

Companies typically do not reveal the number of users and activity, but we can do educated estimates. In a recent post on TechCrunch, Michael Arrington stated that there are about 53 million posts on del.icio.us. Based on the statistics mentioned at the time of the del.icio.us acquisition (by Yahoo) in December 2005, and the growth since then, we estimate the current number of people using del.icio.us at 500,000 [UPDATE since this post was first published, del.icio.us announced they have 1,000,000 users]. From this we conclude that the average user on del.icio.us did a little over 100 posts. This is a pretty impressive number, although it might be the case that there is a fat tail and a handful of users with a huge number of posts.

If we use 100 posts per user as a guide then, we can do similar estimates for other social bookmarking companies. For example, since Blogmarks has a total of 514,205 posts, we estimate that they have roughly 5,000 users.

Here is another interesting angle... a search on Yahoo MyWeb for items tagged "food" results in 7,200 bookmarks. A similar search on BlinkList brings up 120 pages with 20 items per page - or 2.400 bookmarks. In other words, the number of posts tagged with a particular word or term can be used as another relative measure of the number of users.

Finally, here is another method for estimating the number of users. We took a recently popular web2.0 list url: go2web20.net, as well as all time favorite CNN.com, and looked at how many people have bookmarked these on various services. If we do this for a hundred or so randomly choosen URLs, we would get more precise estimates - but this is just to give us an approximation of the number of users. Here is a table showing our results:

BlinkList
40
14,800
568
38,200
Blogmarks
5
1,800
56
3,700
del.icio.us
1,354
500,000 (baseline)
7,429
500,000 (baseline)
Diigo
21
7,750
32
2,150
Furl
53
19,600
200
13,500
Ma.gnolia
9
3,300
51
3,400
Shadows
1
370
21
1,400
Simpy
9
3,300
312
21,000
Stumble Upon
 
1,271,345 (public)
 
1,271,345 (public)

NB: With MyWeb, the estimated users is 114,600. As it turns out we can't compute it with the same method, because information is not quite there. Instead, we used the Tag Comparison method and compared it with BlinkList.

Conclusion

The social bookmarking market is dominated by del.icio.us and StumbleUpon. These leaders split the market, as they bring orthogonal approaches to bookmarking - del.icio.us builds a hierarchy for people to browse (it does related relationships, etc.), while StumbleUpon is more of a random discovery system.

Meanwhile the other players in this market have a lot of ground to make up on the two leaders, based on our analysis in this post.

Update: Added Furl - thanks to Barry Dahl for pointing it out (comment #3).

Update 20/9/06: More updates to the tables and figures above, based on comments.

Update 5/10/06: Updated del.icio.us figure in the main text.

12 TrackBacks

Listed below are links to blogs that reference this entry: The Social Bookmarking Faceoff.

TrackBack URL for this entry: http://www.readwriteweb.com/cgi-bin/mt/mt-tb.cgi/2766

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»links for 2006-09-20 from Hermes

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Ce que l'on appelle le "Social Bookmarking", c'est-‡-dire le partage en ligne de signets (bookmarks, favoris...), a suscitÈ la production de plusieurs outils concurrents de Del.icio.us.† Comment s'y retrouver ?† En consultant le tableau comparat Read More

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There are two web sites I've been using for some time, which I think could be important to your... Read More

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Read/Write Web looks at the evolution of social bookmarking, and catalogs the features of each company offering this service. ... Read More

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Alex Iskold de Read/Write web a dressÈ un intÈressant classement des sites de signets sociaux et essaye d’Èvaluer leur nombre d’utilisateurs relatifs : StumbleUpon (1,2 millions d’utilisateurs) serait largement en tÍte devant Del.ici... Read More

From Read/Write Web analysis, we see that the 2 most popular sites are del.icio.us and StumbleUpon. Actually I use 3 social bookmarking site: del.icio.us, furl, and blogmarks. del.icio.us is the richest service in terms of features: you may use n... Read More

»StumbleUpon Continues To Impress from Read/WriteWeb

We hear a lot about digg, Slashdot and del.icio.us as traffic drivers for media websites and blogs. But one site that doesn't get enough props in this regard is StumbleUpon. In our recent Social Bookmarking Faceoff, we noted that StumbleUpon... Read More

I recently interviewed del.icio.us founder Joshua Schachter, who is now with Yahoo after the popular social bookmarking service was acquired last December. Joshua was recently named as top innovator of the year by MIT Technology Review Magazine. Taggin... Read More

Social bookmarking meets social networking: Blue Dot pushes an evolutionary step forward the basecamp from where future online communities will start forming – Video Intro Blue Dot is a free service that combines the social bookmarking abilities popu... Read More

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Bursts: ---
inserted on: Sep 18, 2006


metacafeInv: 15M (*)Alexa: 138
netvibesInv: 15M (*)Alexa: 980
kayakInv: 11.5MAlexa: 1,600kosmix Inv: 18M (*)Alexa: 51,000trulia Inv: 5.7M (*)Alexa: 6,200
FacebookInv: 13MAlexa: 69WeeworldInv: 15.5MAlexa: 42,800
videoeggInv: undisclosedAlexa: 33,300
SixapartInv: 12M (*)Alexa: 2,500
TechnoratiAlexa: 237
TickleAlexa: 672Acquired by Monster.com
metacafeInv: 15M (*)Alexa: 138
pageflakes Inv: 1MAlexa: 8,600
beboInv: 15MAlexa: 281friendster Inv: 10M (*)Alexa: 41Gaia Inv: 8.3M (*)Alexa: 1,700WeeworldInv: 15.5MAlexa: 42,800
revverInv: 10.25M (*)Alexa: 3,600
BokeeInv: 10MAlexa: 190wikiaInv: 4M (*)Alexa: 3,100
FlockInv: 1MAlexa: 8000YelpInv: 3MAlexa: 2,600
revverInv: 10.25M (*)Alexa: 3,600
Social TextInv: 4M (*)Alexa: 47,000FeedburnerInv: 7M (*)Alexa: 500
EventfulInv: 2.1M (*)Alexa: 3,300TechnoratiInv: 7.6M (*)Alexa: 237
TagWorld Inv: 7.5MAlexa: 2,000
Cuts Pre-launch

OdeoAlexa: 6,500RockYouAlexa: 2,950SnapvineAlexa: 125,000videoeggAlexa: 33,300

wikiaAlexa: 3,100
Biggerboat Pre-launch

BrowsterAlexa: 57,500KrugleAlexa: 25,500RiyaAlexa: 14,100

StumbleUponAlexa: 627
FilmLoopInv: 7M (*)Alexa: 29, 300PandoraAlexa: 1,400
SimplyHiredInv: 1.5MAlexa: 78,500SimplyHiredInv: 3M (*)Alexa: 5,800
KaboodleInv: 3.55M (*)Alexa: 9,000
FarecastInv: 7M (*)Alexa: 12,100OodleInv: seedAlexa: 5,000WinkInv: 6.2M (*)Alexa: 21,700
DiggInv: 3M (*)Alexa: 95FacebookInv: 25M (*)Alexa: 69linkedinInv: 10M (*)Alexa: 222
podshow Inv: 8.85M (*)Alexa: 13,800
friendsterInv: 3M (*)Alexa: 41
RiyaInv: 19M (*)Alexa: 14,100VastInv: 1.5MAlexa: 45,800
snapInv: 10M(*)Alexa: 11,600
taggedInv: 7M(*)Alexa: 2,900
FeedburnerInv: 7M (*)Alexa: 500

Newsgator Inv: 10M (*)Alexa: 2,150

TechnoratiInv: 7.6M (*)Alexa: 237
Judy's BookInv: 8M (*)Alexa: 7,800
Social TextAlexa: 47,000wikiaAlexa: 3,100
FeedsterAlexa: 7,200EventfulInv: 2.1M (*)Alexa: 3,300
DiggAlexa: 95
Gaia Inv: 8.3M (*)Alexa: 1,700myspaceInv: 15MAlexa: 6Acquired by News Corporation
podshow Inv: 8.85M (*)Alexa: 13,800RockYou Inv: 1.5MAlexa: 2,950youtubeInv: 11.5MAlexa: 13
linkedinInv: 4.7MAlexa: 222
podshow Inv: 8.85M (*)Alexa: 13,800
StumbleUponAlexa: 627
BuzznetAlexa: 1,900
netvibesAlexa: 980
edgeioAlexa: 25,000FeedsterAlexa: 7,200TruveoAlexa: 61,500WikioAlexa: stealth
KaboodleAlexa: 9,000UserPlaneAlexa: 1,500Acquired by AOL
slideAlexa: 2,170
koders Inv: 0.76MAlexa: 17,200
EngageInv: 5M (*)Alexa: 34,400
OddcastInv: 4M (*)Alexa: 7,500
Feedburner Inv: 1-2MAlexa: 500
IndeedInv: 5M (*)Alexa: 2,300
del.icio.usInv: 1-2MAlexa: 154Acquired by Yahoo!

The (*) means that more than one VC participated and so the exact amount by this firm is not known. Other things: Angels are indicated in parenthesis. The transaction amounts/links for Angels are not listed since they are typically small and not publicized. Also, note the distinct links to the partner's bio, his blog and the Technorati rating of his blog.

What do you think - is there enough data here to draw conclusions? For example we can see that the most popular category is Search and Classifieds. This makes sense since there are many verticals to apply search to and classifieds is likewise popular. Social Networking and Bookmarking is also very crowded and competitive. What other trends do you see?

UPDATE 18/9/06: Version 2 of the chart has now been published, incorporating the feedback received.

5 TrackBacks

Listed below are links to blogs that reference this entry: The Web VC Chart.

TrackBack URL for this entry: http://www.readwriteweb.com/cgi-bin/mt/mt-tb.cgi/2756

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»links for 2006-09-16 from Ëá™ËØ¥Ëá™Âàí

The Web VC Chart (tags: È£éÈô©Êäï资 web2.0) Top 10 Google apps CNETËØÑÈÄâÁöÑÂ??‰∏™GoogleÂ∫îÁî®Á®ãÂ∫? ÈïøÂ∞æÔºà‰∏âÔºâ ÈïøÂ∞æÁúüÊ≠£‰ª§‰∫∫Â?ÉÊÉä‰πã§ÑÂú®‰∫éÂÆÉÁöÑÊï∞Èá?„ÄÇÂ∞ÜÈïøÂ∞æ‰∏äË∂≥§üÁöÑÈ?ûʵ?Ë°åÁ¥ØÂä†Ëµ∑Ê?•ÔºåÂ∞±‰ºöÂΩ¢Êà?‰∏ĉ∏™ÊØîʵ?Ë°åËøò... Read More

»web2.0„?∏„?ÆÊäïË≥á from „É?„ÉÉ„Éàde„Ç¢„Éä„É™„Çπ„Éà

Á±≥ÂõΩ„?Æweb2.0„?∏„?ÆVC„?ÆÊäïË≥áÁä∂Ê≥?„?å„?æ„?®„?æ„?£„?¶„?æ„?ô„ÄÇ http://www.readwriteweb.com/archives/the_web_vc_chart.php „?܄ɺ„ÇìÂáÑ„?ÑÊäïË≥áÈ°?„?ß„?ô„?≠ Ë™∞„?ãÊó•Êú¨Áâà‰Ωú„?£„?¶„??„Çå„?™„?Ñ„?ã„?™ Read More

»The Social Networking Faceoff from Read/WriteWeb

Written by Alex Iskold and edited by Richard MacManus. With all this buzz around the potential Yahoo! acqusition of Facebook for 1B, we think its time do to the social networking faceoff. Arguably of all services in the new... Read More

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  • The Social Bookmarking Faceoff - Content

    The Social Bookmarking Faceoff

    Written by Alex Iskold / September 18, 2006 5:56 PM / 74 Comments

    Written by Alex Iskold and edited by Richard MacManus.

    The social bookmarking market is in a steady state with two dominant players - del.icio.us and StumbleUpon. The rest of the pack, including Yahoo MyWeb, appears to be substantially behind. Will they catch up? In this post we attempt to answer that question.

    We also take a look at how social bookmarking has evolved since del.icio.us. (even del.icio.us itself has evolved a lot!). We compare the features and approaches of the different companies, to see which has gained popularity and what has become the norm in this space.

    A short history of social bookmarking

    The current social web era started with del.icio.us and the advent of social bookmarking. The simple concept of a tag has turned our interactions with the web upside down. The idea of being able to store your bookmarks online, share them with everyone and see what others have bookmarked - triggered the sequence of events that resulted in today's rich and social web ecosystem.

    We used the e-consultant and go2web20 lists of social bookmarking services to select the companies. Note that we did not include any company with an Alexa rank of less than 100,000. We also did not profile social news sites (like digg) or social shopping sites (like Kaboodle), as they will be profiled in separate R/WW posts.

    Feature comparison

    Note: Mouse over the column headings to see full text

SiteImpPop RecRel DirFrdRatPriTag sug RSSWidBrw APIProsConsSiteImpPop RecRel DirFrdRatPriTag sug RSSWidBrw APIProsConsSiteImpPop RecRel DirFrdRatPriTag sug RSSWidBrw APIProsConsSiteLinks to go2web20.netEstimated users based on go2web20.netLinks to cnn.comEstimated users based on cnn.com  Audio, Photo and VideoBlogging, RSS, Webtops, WikiSearch and ClassifiedsSocial Networking and Bookmarking
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