Niche Social Networks might be the way to go in getting those links to your websites:

1. AgentB (Deals)
2. Advert Lover (Advertisements)
3. AutoSpies (Autos)
4. Babblz (Parenting)
5. Ballhype (Sports)
6. blogs4God (Christian)
7. Care2 (Social Action)
8. Dealigg (Deals)
9. Dissect Medicine (Health & Medicine)
10. DNHour (Domaining)
11. DZone (Developers)
12. Game Diggity (Game Videos)
13. Hugg (Environment)
14. JudysBook (Deals)
15. Meme or Lame (Gadgets)
16. News Heat (Politics)
17. PickStation (Music)
18. Pixel Groovy (Web Design)
19. Plant Change (Environment)
20. PlugIM (Online Marketing)
21. qoolsqool (Education Resources)
22. ScoreGuru (Sports)
23. Sk-rt (Lifestyle)
24. Sphinn (Search Engines & Online Marketing)
25. Stylehive (Fashion)
26. TTiqq (Tips & Tutorials)
27. Tweako (Computers & Technology)
28. Video Bomb (Videos)
29. VideoSift (Videos)

Here’s a couple niche social networking sites from Zedomax Network:

1. Wagg.It (Blogs in general)
2. WagThis.com (Bookmarking by waggin’)
3. StinkyWorld.com (Hollywood Gossip)
4. MaKePoNo.com (Shopping)
5. DeClubZ.com (Weird & Bizarre)
6. PoliceChase.TV (Police Chase Videos)

via tropicalSEO