Kamcord - Live stream anything on your phone's screen
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Gamurs - A social network for hardcore gamers
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Player.me - Player.me is the social discovery platform for the gaming community.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.