Well the posts seem to be 'helpful' at a glance. But there are times when those involved to some degree in a crime want to appear helpful and steer an investigation. They think they are smarter than the police.
Let's see....who might fit that …. wait a minute....Garret Beater thinks he's smarter than everyone else....you don't think?....Naaah. Couldn't be that obvious. Could it?
There were some interesting posts made by him on the groups for that girl, but honestly I chalked it up more to him being a nut and wanting to feel important. To me it comes down to, does anyone really think he'd be smart enough to get away with murder, based upon what we've seen.