[ry0ohki]

This is an incredibly hard and most likely frustrating thing to do. Social networks require momentum to work. In other words, I won't join your social network unless most of my friends are there. Facebook was able to gain traction on MySpace because it started with a niche (colleges), LinkedIn also has a niche (business). Perhaps you can start with some sort of niche (furries?) and if the user experience is good, that community may extend it to their friends.