No direct proof, but ask yourself if it is too much of a coincedence that eight (8) new ID's would show up on a Yahoo stock message board, all within a period of 24-48 hours, with the sole intention of posting mindless drivel that portrays the company in a negative light.
Also each one of these ID's are brand new and have only posted on this message board.
I think the odds defy that as being a random occurence.
With regards to your second question, I view these posts as just another attempt by a psychopath who is trying to manipulate others, and gets a rise out of being an annoyance.
If this person truly believes that he can influence investment decisions on a stock message board, then he/she suffers from a much larger delusion.
It's most likely a pissed-off investor who is underwater on his/her investment in CSUH and is unwilling to accept personal responsibility for their own decisions.