It's not clear who fabricated the claims, but they definitely took advantage of Clinton supporters' willingness to spread dubious attacks on her enemies and their tendency to go after anyone who questions them. I mean, a dating site claiming to be UN members and that the UN is conspiring against them is way out there in nutty conspiracy-theory land, but if you look at the comments on say the Daily Kos article about this people didn't just go along with their claims, they even accused people questioning them on places like Twitter of all kinds of nasty things.