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FairTrip - The sustainable travel app
Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
Nightly - One part dating, one part social, one part nightlife
BookCrossing.com - It's the World's Library. It's a smart social networking site.
Askfortask - On-demand App for pick up , cleaning, plumbing, handyman, moving and other tasks in your area
InterPals - InterPals is a friendly community of over 5 million friends, language learners, travelers and penpals.