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Steve Weber
Netscape
America Online/Netscape launched a Digg-style, user-driven news
Flickr
photographs. Amateur and professional photographers upload their
favorite photos to share with friends and strangers, who can assign tags
and add comments. Yahoo bought Flickr in 2005.
YouTube
YouTube is similar to Flickr but primarily features amateur and
professional video content. After uploading, users can add comments,
tags and link to favorite videos from their own Web site. Google agreed
to buy YouTube in 2006.
Popurls
highly trafficked social bookmarking sites, updated frequently.
Listible
sites resources classified by tags such as design, movie,
opensource, or firefox. Lists are popular with many Web users. Users
can rate the items on the list and post comments.