|Don't like Facebook Messenger? Too bad!|
Facebook expects to end its web-chat functionality completely come summertime, to push users towards Messenger. The Messenger app is much easier for the company to monetize, as opposed to the simpler mobile-browser versions.
Don't fret, however, if you still need some time to sort through your old messages. You will have "until summer" to get ready for the big move, at which time you will be locked out of the web-app Facebook chat.