Twiends is a remarkably innovative mechanism to get you more Twitter followers, Facebook page fans and Youtube viewers. Twiends is a seed-based; When you follow others you earn seeds from them, which you can offer as an incentive for others to follow you and promote your profile. You can also set number of seeds you are offering per follow and whom you want to follow.
Twiends claims 500,000 members and I believe it could be more than that as I'm a big fan of the service. Now, let's see how you will grow your social network..