Facebook is full of secrets - and not just the affairs, double lives, civil service careers and faked qualifications that populate the billion-plus profiles that exist on Mark Zuckerberg's social network.
The service actually has a number of hidden features that only true Facebook ninjas know about.
Fortunately they're also accessible to anyone with the time and willingness to watch a two minute video.
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Check out the secrets of Facebook above, and prove to your friends that you know the ways of the Selfie Emoji.