| 900,000,000 | 2 | |
| 310,000,000 | 8 | |
| 250,000,000 | 26 | |
| Tumblr | 110,000,000 | 34 |
| 32,000,000 | 60 | |
| Stumbleupon | 28,000,000 | 152 |
| Digg | 6,000,000 | 452 |
| MetaFilter | 4,500,000 | 3600 |
| Newsvine | 4,000,000 | 3934 |
| Folkd | 3,000,000 | 2093 |
| Fark | 2,500,000 | 2943 |
| Scoop.it | 2,000,000 | 591 |
| Slashdot | 1,600,000 | 1631 |
| Delicious | 1,500,000 | 1235 |