Mean people stink.
Unfortunately, the world is full of them, and your children may not necessarily understand that. In a Internet age where texting with emoticons and shorthand are realities, fully understanding what people are looking for from a status, a message, an IM, a posting, etc. can be confusing, even for experienced adults. That’s why I’m glad that there are programs like iNet Protector.
It’s a web and network monitoring tool for Windows that can be used on your home network.