Wadja is a social network that helps you label conversations and open up to the world. Also, you can use their API to integrate the information with your own service.
Venture Slogan: Label your life.
Wadja’s description: “…Wadja helps you label content and conversations, in real-time. Create your personal, customized, label”tags” and open up a whole new world of messaging…”
Venture Link: wadja.com