Facebook Messenger has reached a new milestone as the service now claims 800 million monthly users, according to an announcement from Facebook itself on Thursday. “I’m happy to report that we’ve made a good step in that direction, and toward the end of 2015, we crossed the milestone of 800 million people using Messenger each month,” according to David Marcus, Facebook's Vice President of Messaging Products.
The new milestone, according to latest Nielsen data, makes Messenger the fastest growing app of 2015.