Far or Near - Far or Near™ is a privacy-oriented social network that helps you connect with others who share your...
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Meetupedia - Looks nice. Easy Facebook registration. Hard to find groups in your area due to no location search.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
lclz.in - Have you ever wondered where your friend are ?