Content Diggers - Content todo list for you and your friends
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Must App - Your personal movie assistant
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Foundora - Human-curated Reading List & Content Hub for Entrepreneurs.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.