'Friends Day': Facebook celebrates already made up event on a different day to usual

Facebook is celebrating "Friends Day" around the world, showing a video to more than a billion people. The company has celebrated the made up holiday – ostensibly to celebrate "the importance of connecting" – the last two years. But in 2015 and 2016 it was celebrated on 4 February, which Facebook said at the time was also its birthday, and comes two days after it is being celebrated this year. It isn't clear how the day came about, how it is intended to help its users or what it's actually for. Facebook is celebrating by showing a video to every one of the more than a billion people who log into it each day, in which a person made up of tiny pictures of a users' friends is shown dancing around.