Well the thing with lies is that even online (where maintaining a deception is arguably easier than it is in person) is that they will unravel eventually. I watched an unravelling happen over a course of years (it seemed incredibly slow/like it was never going to happen at the outset, and then eventually it started and then it seemed to speed up and now I don't think the person quite knows what hit them but they once more (because this seems to be a recurring pattern) can't seem to figure out why their friends keep abandoning them "for no reason".
at least as far as I can tell from one of their main victims who occasionally checks their socials to witness the trainwreck I told them would happen and then tells me about it