Stop -- Stop. Do not answer back. Don't reply. Don't post anything online.
Block -- Block the person or message.
Tell -- Tell a trusted adult.
Aftab also advises parents and other adult caregivers to "take five": Put down the mouse for five minutes and do something that will help you regain balance and perspective.
She says that if there are threats, parents need to report that to the site or to law enforcement. Don't try to take it into your own hands.
Family therapist Terry Real says that an ounce of prevention is worth a pound of cure. Take a look at the kids' history on the computer and talk to them about it. Unplug the computer if you have to!