Facebook messages are lock-in. Back when I used it a lot, you could connect via XMPP client. But there is now no way to get your own messages out of their eco-system that I am aware off. It's like switching a dumb-cellphone to another cellphone, you loose all your old SMS (if the aren't stored on the SIM card and there is no PC link cable+software). Open standards like IRC, email, XMPP prevent something like this to happen.
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Facebook messages are lock-in. Back when I used it a lot, you could connect via XMPP client. But there is now no way to get your own messages out of their eco-system that I am aware off. It's like switching a dumb-cellphone to another cellphone, you loose all your old SMS (if the aren't stored on the SIM card and there is no PC link cable+software). Open standards like IRC, email, XMPP prevent something like this to happen.