When acting as a professional representative of the college and/or a department, office or organization via social media, uphold the same standards you would if interacting in person, on the phone or via email. Be courteous and try to understand their concerns or questions. Avoid things like obscenity, insults or hate speech. Realize that you may be their primary or only point of contact for the college on that issue, and you need to put your best face forward while providing accurate, helpful and timely information. You are an ambassador of whatever entity you represent and the college as a whole.
Zappos.com, one of the best companies in this field, boils down its social media conduct policy to four words that could apply to anyone in any realm of social media:
"Don't do anything stupid."