| API | Description | Category |
| 43 Places | Social travel goals | Community | 2008-07-02 |
| Bebo | Social network | Community | 2007-12-12 |
| BibSonomy | Social bookmarking | Bookmarks | 2007-12-09 |
| Buxfer | Personal finance service | Financial | 2008-05-18 |
| Cambrian House | Crowdsourcing service | Community | 2007-10-10 |
| COLOURlovers | Named colors and color palette services | Tools | 2008-04-20 |
| coRank | Distributed user reviews service | Community | 2007-08-13 |
| DandyId | Social graph management services | Community | 2008-06-01 |
| dopplr | Community travel service | Travel | 2007-12-23 |
| Facebook | Social networking service | Community | 2006-08-16 |
| fav.or.it | RSS reader and blog platform | Feeds | 2008-02-10 |
| Fire Eagle | Geo location sharing service | Mapping | 2008-03-04 |
| Flux | Social networking platform from Viacom | Community | 2008-02-16 |
| Frengo | Mobile widgets and messaging platform | Messaging | 2008-04-12 |
| FriendFeed | Activity stream aggregator | Other | 2008-03-25 |
| Friendster | Social networking service | Community | 2007-10-25 |
| Gnip | Ping and data portability services for user data | Internet | 2008-07-01 |
| Google Social Graph | Search service for finding social connections | Community | 2008-02-01 |
| Hi5 | Social network service | Community | 2007-10-12 |
| HotOrNot | Dating rating site | Dating | 2005-10-30 |