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

4chan - 4chan is a simple image-based bulletin board where anyone can post comments and share images.

TechEvents.co - Tech and startup events aggregator

Lainchan - Lainchan is a great imageboard package, actively building on it and adding a lot of features and...

Facebook Local - Discover places to go and events happening near you

Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.