Facebook has announced that 500 million people are now chatting through the standalone Messenger application which was controversially pushed onto members in July.
Facebook ran the app as a standalone and online service for some months before telling users that they must move to the former option.
"In the next few days, we're continuing to notify more people that if they want to send and receive Facebook messages, they'll need to download the Messenger app," the firm said this summer.
"Our goal is to focus development efforts on making Messenger the best mobile messaging experience possible and avoid the confusion of having separate Facebook mobile messaging experiences."
Facebook said that it now has 500 million users exchanging and reading messages each month.
"Messenger was the first of our standalone apps and, unlike our core Facebook apps, it focused on one use case - messaging," the firm said in a blog post.
"With Messenger, you can reach people instantly. It is just as fast as SMS but gives you the ability to express yourself in ways that SMS can't.
"You can send stickers or videos, take selfies, chat with groups and make free calls. We've also continued to improve speed and reliability. Updates to Messenger ship every two weeks so it continues to evolve and improve."
Facebook has issued information about an updated Messenger service for Android that should arrive on 29 November.
The company said that the app will make it clearer when other users are online and make it easier to connect with contacts and interact with the software.
Cotton seedling freezes to death as Chang'e-4 shuts down for the Moon's 14-day lunar night
Fortnite easily out-earns PUBG, Assassin's Creed Odyssey and Red Dead Redemption 2 in 2018
Meteor showers as a service will be visible for about 100 kilometres in all directions
Saturn's rings only formed in the past 100 million years, suggests analysis of Cassini space probe data
New findings contradict conventional belief that Saturn's rings were formed along with the planet about 4.5 billion years ago