Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Great F*cking Startup Advice - Strongly worded suggestions for startup founders
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Startup Notes - Most actionable advice from each Startup School speaker
Bigtent - BigTent is a web-based organization and communication portal for groups.
First Search - The world's best startup advice, curated and searchable.