Came across this cool piece of information. If your planning on creating a social site then take a quick look over these pointers. You may learn a thing or two!
1.Build an open vs. closed community
2.If you build it, they don’t necessarily come
3.Well integrated to the rest of the Website
4.Adequate staffing/moderation resources
5.Highly transparent, meaningful member ratings
The link below gives more details pertaining to each point above…