First off, this is probably not for kids, there's nothing to terrible about it, but It's better to not wander too far out of a certain aspect of the site. Unless you have a friend with an ask.fm account, it is not very active. Strangers tend to not bother people they don't know and stay in a group of people they know, but there's still about a 7% chance that a random person will contact you. Even though it's a website where you answer people's questions, it's surprisingly safe from people outside of the site. It's almost impossible to find someone unless they know about the site and they have an account (and you can't get on the website unless you have a link, which is impossible to find unless the user post it elsewhere.) That's not to say the security is flawless. Keep in mind that it is a site where you get questions from others, and though ridiculously hard to track, it's not impossible. But it's not like the user is powerless to stop the person from asking questions, they can block and report a user. But for younger kids, it's not likely that they will know what the best thing to do is. But the big point is what it is being used for. Unless you are using it because your a popular youtuber, or you use it for a Q&A page, there aren't a lot of reasons to have an ask.fm page anyway.