Not at all...the condition of the probation was that they NOT DRINK. If the web site had only been obscene messages to the judge, nothing could/would have been done. BUT they were stupid (again) and displayed evidence for all to see that they had disobeyed the conditions for probation by drinking!
They deserved to have their probation revoked.
It can't be proved by looking at a computer monitor that they were drinking, no matter what they showed or said or did. Don't you guys on the judge's side see that?