Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.

Hometown Tourist - Local recommendations to discover the best of the city

Palaround - Meet people you should be friends with.

inviita - inviita is a free app that instantly creates tours that match your mood, in any city in the world.

Babble - A more personalized social network

Tripadvisor - The Tripadvisor mobile app is available for the Android and iOS platforms. It can be used to create reviews of hotels, restaurants, and to chat with other travelers on Tripadvisor forums.