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Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
Event Hunt - Startups and Tech Events Curated By Locals
BookCrossing.com - It's the World's Library. It's a smart social networking site.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
InterPals - InterPals is a friendly community of over 5 million friends, language learners, travelers and penpals.