| API | Description | Category |
| BibSonomy | Social bookmarking | Bookmarks | 2007-12-09 |
| Blogmarks | Social bookmarking | Bookmarks | 2005-10-30 |
| Blue Dot | Content sharing community | Bookmarks | 2006-09-18 |
| Cogenz | Social bookmarking service | Bookmarks | 2007-09-20 |
| Connotea | Bookmark and reference sharing for researchers | Bookmarks | 2007-10-20 |
| del.icio.us | Social bookmarking | Bookmarks | 2005-10-30 |
| Digg | Community driven news links and ratings | News | 2007-04-20 |
| Dipity | Interactive timeline creation services | Photos | 2008-08-02 |
| GroupMe | Social bookmarking | Bookmarks | 2007-12-25 |
| Jots | Social bookmarking | Bookmarks | 2005-12-13 |
| linkaGoGo | Social bookmarking service | Bookmarks | 2006-03-09 |
| myFeedz | Blog services | Blog Search | 2008-02-09 |
| OnlyWire | Social bookmarklet service | Bookmarks | 2006-03-01 |
| PostRank | Community driven rankings and bookmarks | Feeds | 2008-07-19 |
| Raw Sugar | Web directory service | Other | 2006-03-06 |
| Rrove | Social Bookmarking for Places Create & Share Maps | Bookmarks | 2006-02-23 |
| Shadows | Social bookmarking and community | Bookmarks | 2005-11-19 |
| Simpy | Social bookmarking | Bookmarks | 2005-10-30 |
| Tagyu | Tag recommendation service | Tagging | 2005-10-29 |
| ZoomClouds | Tag cloud service | Other | 2006-03-01 |