现在很多书签网站都采用的nofollow标签，这样提交网站后对pr值提升没有作用。
如果你想多几个反向链接，尽量使用DoFollow的Social Bookmark网站提交。
下面22个都是dofollow的：
| Title | Current Google PR | Google Backlink | Yahoo! Backlinks | URL |
|---|---|---|---|---|
| Backflip | 6 | 502 | 33,059 | http://www.backflip.com/ |
| Bibsonomy | 7 | 2,300 | 779,947 | http://www.bibsonomy.org/ |
| LinkaGoGo | 6 | 129 | 59,769 | http://www.linkagogo.com/ |
| Mister-Wong | 7 | 67,500 | 8,979,013 | http://www.mister-wong.com/ |
| Spurl | 6 | 1,990 | 4,945 | http://www.spurl.net/ |
| Buddy Marks | 5 | 80 | 807 | http://www.buddymarks.com/ |
| MyLinkVault | 5 | 53 | 11,587 | http://mylinkvault.com/ |
| SpotBack | 5 | 2,590 | 762 | http://spotback.com/ |
| A1 Webmarks | 4 | 43 | 13,108 | http://www.a1-webmarks.com/ |
| ClipClip | 6 | 3,270 | 16,269 | http://clipclip.org/ |
| Connectedy | 5 | 72 | 11,207 | http://www.connectedy.com |
| OYAX | 4 | 253 | 58,771 | http://www.oyax.com/ |
| MyVmarks | 5 | 459 | 104,445 | http://www.myvmarks.com/ |
| TeDigo | 4 | 7 | 191 | http://www.tedigo.net/ |
| Complore | 4 | 74 | 17,295 | http://www.complore.com/ |
| Ez4U | 3 | 41 | 759 | http://ez4u.net/ |
| Info4it | 3 | 25 | 139,289 | http://www.info4it.com/ |
| MyPIP | 3 | 13 | 407 | http://www.mypip.com/ |
| Space-Ed | 3 | 1 | 9 | http://space-ed.com/ |
| SyncOne | 3 | 27 | 6,792 | http://www.syncone.net/ |
| Yattie | 3 | 5 | 529 | http://www.yattle.com/ |
| Upchuckr | 4 | 44 | 625,647 | http://www.upchuckr.com/ |
还有几个未经测试，Myjeeves.ask.com， Health Ranker，Furl.net，Diigo.com，Jumptags.com，Dizzed，Bookmark Tracker自己去研究。。
