I fail to see what the fuss is about this incident.
Independent of whether the ruling makes sense or not, considering the stringent probation restrictions, using Facebook without written permission was foolish or an attempt to skirt the law.
That said, the text from the probation report taken from the perspective of this man's case, clearly attempt to regulate his ability to attract and interact with minors.
Visiting Facebook, or any other website was not a violation of his probation. Posting on those sites is the violation.
While this may seem like a ridiculous restriction, the man involved was let out of jail based on following certain rules that were intended to prevent him from potentially endangering society. He violated those restrictions and went back to jail.