DontStayIn
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Alexa Rank 05/07: 4,933
Alexa Rank 10/07: 7,935
Alexa Rank today: alexa

Member base: 250,000

Strategy: F, P

About: Night life and social events. Party crowd, but past teen. Profile, news, articles (press releases), photos, contests. Clubbing, news, competition and reviews. 89 countries represented.

Fotki
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tag research - http://search.fotki.com/?q=TAG

Alexa rank 05/07: 756
Alexa Traffic rank 10/07: 900
Alexa Rank today: alexa

Member base: 1,000,000

Strategy: F, P NF

About: Photo share, blog, profiles, friend lists.

Create a profile and on the links page of the profile add your urls.
Links page is only page that doesn’t have a ‘nofollow’ attribute. 

Flickr
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cloud

Alexa rank 05/07: 47
Alexa rank 10/07: 29
Alexa Rank today: alexa

Member base: 4,000,000

About: A photo upload, share and tagging site.

Strategy: FE, P, po
Upload and tag photos using most popular tags from cloud.
Create a profile and join groups (also share urls in group posts).

Notes: Owned by Yahoo. One of the first sites to employ tags.

“The information you get [through tags] is always going to be somewhat imperfect and fuzzy,” says Joshua Schachter, the creator of Delicious. “But a bunch of people doing ‘okay’ tagging may actually have a higher net value than an authoritative organization telling you how information should be organized.” (June 2005)

Passado
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cloud

Alexa rank 05/07: 22,356
Alexa Rank today: alexa

Member base: 4,700,000

Strategy: F, P
Tag your photos and posts with popular tags. Link to your site from your profile.

About: Photos, blogs, profiles.

FaceBook
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Alexa Rank 05/07: 173
Alexa Rank today: alexa

Member base 03/07: 23,000,000
Member base today: 40,000,000

Strategy: F, E
Everything is behind a login. Time intensive but website links and your blog’s RSS feed, as well as your StumbleUpon ’stumbles’ can be left in your profile.