[flatline]

I probably don't have any real gems but generally, non-sequitur stuff that clearly wasn't an intentional post is the most funny, as it jumps out an makes you wonder what the hell is going on. Promotion of weird/bad products, i.e. spam. The 4chan FB hacks from that christian message board a couple years back were actually pretty funny, albeit juvenile and insulting. Maybe the heuristic would be that a good percentage of one's friends think you were hacked without you knowing about it, but nothing too shocking or harmful. Just my $.02, I did think it was a neat idea.