mitgag, I disagree to that, as

1. I was in grade seven last year, they aren't as dumb as you may think.

2. Again grade sevens are smart, majority of them wouldn't write something if they didn't know about it.

Also the website doesn't ask for an age, therefore they are doing nothing wrong.

I think that grade seven students are mature enough to handle a bad word, after all they are in middle school/junior high school and most of them probably say those words too. Maybe you shouldn't go on this website on school computers though, that might be a bad idea as you and your students could get in trouble over that. Great idea at home though, for the purpose of the debate.