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"Think before you post, because once you do, it's going to be up there forever," Shehan says.
That way, if someone's viewing porn, you'll have the records to deal with it.
Software filters aren't a perfect solution; some nasty sites can slip through, while educational or family-rated sites may be blocked.
So while some parents may wonder whether monitoring means they're spying on their kids, the safety factor often wins out.
"They come across to the children as their new best friend.
They're going to have the same likes and dislikes," Shehan says.