Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
All Tech News - Tech news from 41 sources, all in one place.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
The Tech Memo - A weekly 1-min summary of top tech news for busy founders
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Inside.com - Real news, curated by real humans