Facebook might look like a fairly simple proposition at first: post pictures of your children/food/skiing holiday, make inappropriate jokes and rash political arguments and obsess over people you went to school with.
As it turns out, it's not that easy. And a lot more fun.
This video shows that there are at least five hidden Facebook features that are either (a) mildly interesting or (b) really totally amazing.
Take a look below and let us know if we've missed any out in the comments.