In a blog post, Facebook head Tom Alison said that the company is planning to once again incorporate the Messenger app into Facebook, and is already testing the new combined experience with some users. According to Alison, the change will make it easier and more convenient for Facebook users to message their friends and share content without having to use the Messenger app separately. Alison also said that the combined experience will soon be rolled out to more people, although he didn’t offer an ETA for that.
Messenger Returning To The Facebook Mobile App