Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Remote Meals - Recreating office lunches for remote workers
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Pizzatime - Host a pizza party for your remote team
Bigtent - BigTent is a web-based organization and communication portal for groups.
SpatialChat - Virtual space platform to help remote teams collaborate.