Facebook Messenger is now catching up with sister company Whatsapp, as it hits the milestone of one billion users.

Being the largest social network in the world, this achievement is important for Facebook, with the company having spent many years trying to boost its Messenger service.

The social platform now plans to send a billion 'thank you' messages to Facebook Messenger subscribers, which will include floating balloon animations that users can send to their friends within the app.

In a statement, Facebook Messenger chief David Marcus said: "We remain focused on helping connect people to the people and businesses who matter most. Thank you to everyone who uses Messenger around the world, and we're looking forward to connecting the next billion."

This milestone became possible after Facebook opened its Messenger service to anyone in the world, regardless of whether or not they have an account.