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Name: Facebook Messenger
Facebook, being one of the most popular social networks worldwide, is not just about posting and reviewing status updates. Instead, the messenger feature is also useful for sending quick text, link and picture-based messages -- and so a dedicated Facebook messenger application is a reliable and free way to keep in contact.
Tango Text, Voice & Video
Name: Tango Text, Voice & Video
If you're not a fan of Skype, Tango is a fair alternative. You can make video and voice calls, send text messages and play games with friends and family. The app also has a useful group chat feature for more than two callers.
Google+ as a social network may not rival Facebook in size or user base, but the Hangout feature does set it apart. You can make 'calls' to invite Google+ contacts to join a multi-user conversation online, or be content to share status updates and images. The 'effects' feature in a Hangout are worth a look too, if you want to see yourself with a crown or pirate hat.