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Polywork - Polywork is a professional social network that allows you to post updates about what you're up to (in work, and, if you like, in life too).
Startup School - How to start a startup, by Y Combinator
Affinity - Relationship Intelligence, Reimagined
YC World - Explore Y Combinator companies by country
Twitterpreneur OS - Ignite your online empire with social media mastery.
Y Combinator Companies - Interactive list of all 1000+ YC companies