AngelList

Mobile educational games

Identify and reward your most influential users with our drop-in social platform.

News, re-imagined

Modern People Search Engine. YC W2012. Ark.com

The easiest and most private way to share things with your significant other (YC W12)

Stay connected with family & close friends.

Share like you do in real life, in intimate Circles

Gaming

Communicate more efficiently.

A social store curated by users.

Crowd-powered sports coverage

Powering communication for teachers, students, and parents

Dead-simple e-commerce (w/ payments) across social, mobile, and web. AngelPad S11.

Reinventing mobile app analytics. Powered by @TechStars and @500startups

Promoting mobile apps with video trailers

Social Gifting Platform for Restaurants

Distributed Khan Academy

Mobile Engine for Web Devs

Learning Platform for True Musicians

Price comparison meets automatic replenishment on the items you buy over and over again.

Insight through (Mobile) Engagement

Location-based question and answer service.

Safe driver score (YC S11)

App Distribution Platform

40 startups launch in front of judges (the successor to TechCrunch50)