Join - Join is a marketplace for influencers and advertisers to collaborate.
NYT Cooking - iPhone app with 17,000 free recipes from The New York Times
Tribyo - Discover, connect and interact with people with similar interests.
munchlab - Get recipes based on ingredients you have at home
Affimity - A social network with interest-specific channels, like on TV
Mary's Recipes - Healthy meal planner for families