28 August 2015.
And finally, over 1 billion people used Facebook on Monday, the first time so many people used the social network in a single day.
Facebook reached 1 billion users in late 2012, but this is the first time that that many have logged in in one day.
Facebook founder Mark Zuckerberg said he expected the see the social network's growth continue, with the focus being on regions with developing internet populations, such as Africa, Latin America and Asia.
Facebook is the most popular social network in the world, with around 1.5 billion users from all over the globe.