Vertical Social Networks

[FirstProject]

I am doing a paper on low budget startups in the vertical social networking field. Here is a list of some:

FriendsEAT.com (http://www.friendsEAT.com)- Food and dining Social networks
ClubMom (www.clubmom.com) - Mommy Social Network
Bake Space (http://www.friendsEAT.com)- Recipe Social Network

Anything with video games?

[Aniket]

This is really low cost i mean everything on this network is by donation only .
But the best part it is still free.:
www.limesphere.com