Yelp!

Yelp!: "When you want to find good local businesses you ask the people you trust. Just enter what you're looking for, together with your friends' email addresses. Friends will receive your request by email. Then, they recommend a business us ing Yelp! (sign up is not required). If they can't help, they can forward your request to one of their friends. When
your friends respond, you get an email. Just return to Yelp! to see
their recommendations."

Silliest socal network idea, ever.