Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Summer - The playlist for anything

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Content Diggers - Content todo list for you and your friends

Bigtent - BigTent is a web-based organization and communication portal for groups.

Faves - Curated content from silicon valley's greatest minds