Thaw - Meet people you should know, but don't
Floobits - Floobits brings real-time collaborative editing to text editors, IDEs, and now Atom.
TaskRabbit - TaskRabbit connects you to safe and reliable help in your neighborhood.
One Degree - The Human Search Engine
Penpal Café - Find a person you can share your observations with.
Keyory - Schedule periodic emails and get aggregated responses delivered right to your inbox with Keyory.