I think every Bounty Campaign nowadays offers Twitter and Facebook Campaigns, but only some projects are offering a LinkedIn Campaign. If you also have a good LinkedIn account for Bounties, but you can't find any, here are some links:

1. RedCab: https://bitcointalk.org/index.php?topic=3835338.0

2. Sparkster: https://bitcointalk.org/index.php?topic=4362427

3. Tripterium: https://bitcointalk.org/index.php?topic=4430160

4. XTRD: https://bitcointalk.org/index.php?topic=4477525

5. UMCA: https://bitcointalk.org/index.php?topic=3812703

6. Quadrant Protocol: https://bitcointalk.org/index.php?topic=3739014.0

7. PayBlok (Bounty0x): https://bitcointalk.org/index.php?topic=4439686.0

8. Multiven: https://bitcointalk.org/index.php?topic=3075298.0

9. Hilo: https://bitcointalk.org/index.php?topic=4502391.0

10. eConomic.net : https://bitcointalk.org/index.php?topic=2897866

11. BizShake (Bounty0x): https://bitcointalk.org/index.php?topic=4404832

12. BitEsprit: https://bitcointalk.org/index.php?topic=3222581.0

13. P2PEP: https://bitcointalk.org/index.php?topic=4435456.0


More to come!


Enjoy!