Just popping in to see if there were any new developments and I haven't caught up yet, so I just wanted to answer this since I was the one who posted about the FB and initiated it.
Yes, posting to random chicas after he knew Celina was missing. The source of this information was that most of us who were here in the beginning couple days saw it on his facebook. I think that if you go back to thread one, maybe two (I wasn't posting yet on the first day, I don't think, but it was being discussed by the second day when I was, I am certain) a bunch of us looked at his facebook and he had posted at 9:11 am "i live in Canaan VT" failure to cap the "i" included, on one of the girl's pages. I don't remember the name of the girl, but it looked like one of this other...honeys. He claims that he found she was missing between 8 and 830 that am and the post was from 9:11 am that day.
When you clicked on the actual post, it took you to a looooooooooong string of comments on his post and then when you read the comments, it was a ton of people all saying that he was a perv and should have been out looking for Celina. To my knowledge, he has not been back on his facebook since this happened, and if he has been he has been doing everything privately. The friends on his fb friends list have been dropping like flies. Because of the lack of activity and the fact that he never made it private, some of us, myself included, speculate that the girl who had this on her wall, with all of the comments didn't want it there and deleted it and possibly was one of the people who dropped him as a friend.
ETA: Lots of things have dropped off of there, and I assume it is because as these people have been deleting him they also delete the posts. There was more recent activity before the one from a week before she was gone, but as his friend count has dropped, less activity has been showing.