Question about internet...?

Schools can monitor anything and everything that happens on their computers. HOWEVER most websites such as yahoo mail, gmail etc. are blocked because the school has no control over what is sent and recieved through those. So since yahoo support group is a 3d party website, i would think it is unlikly that that they will be able to read what you said, unless an admin actually takes the time to make an accout on his own time to see what you posted.