I only had a couple run-ins with him online, but this doesn't surprise me at all. I've been an administrator on the English Wikipedia for over a decade now, and used to have a bit of a high profile on there. He would privately contact me occasionally trying to get me to make questionable edits to Wikipedia on his behalf. He came off as smarmy, manipulative, and his messages would occasionally veer into oddly sexual, inappropriate territory. I was sort of in awe of his "hacker" status at the time, which was why I put up with it for as long as I did, though I did eventually stop responding to him. This was well before the Manning stuff.