There's posts dated from when he didn't have Facebook, how is that possible?

A guy that I had an ONS with started messaging me on Facebook messenger, it said he was using messenger without Facebook. I looked and couldn't find his profile, as we were friends before.

Now he's sent me a friend request and I can see posts he's put on from when he supposedly didn't have Facebook.

How is that possible?

There's posts dated from when he didn't have Facebook, how is that possible?
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