| Google+ | 9 | NA |
| 9 | 27 | |
| Tumblr | 8 | 34 |
| Examiner | 8 | 519 |
| Google.com bookmarks | 8 | 2000 |
| 8 | 61 | |
| Citeulike | 8 | 13478 |
| Friendfeed | 8 | 1452 |
| Delicious | 8 | 1321 |
| Slashdot | 7 | 1568 |
| Newsvine | 7 | 3865 |
| Technorati | 7 | 2032 |
| Digg | 7 | 494 |
| Fark.com | 7 | 2169 |
| Diigo | 7 | 2321 |
| Scoop | 7 | 24543 |
| Folkd | 6 | 2154 |
| wwwhatsnew | 6 | 6171 |
| Svejo | 6 | 17231 |
| Pearltrees | 6 | 4211 |
| Blinklist | 6 | 6432 |
| Dzone | 6 | 2643 |
| Squidoo | 6 | 865 |
| Metafilter | 6 | 3543 |
| Allvoices | 6 | 3776 |
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