Roblox is a great game! As a Roblox player for two years I know what the community is like. The site itself is perfectly safe it's just the Roblox community you need to be careful about. Kids on this game like to be very annoying and immature. Some of them going as far as cussing in the Roblox chat and doing erotic roleplaying. I would say that if your kid is young you should monitor them. Doing so would fix a lot of problems within the community. If you want to go further you should make sure your kid's account is under 13 (Activates safe chat). You can also disable chat in the settings. Another feature that is very useful but not many people know about is the mute feature! All you have to do is type /mute username in the chat. Doing this hides the person from the chat and you can no longer see what they type. You can also block users if you want, but it does not hide what they say in the chat. So my opinion on Roblox is, that it is safe as long as you watch your kid and take precautionary measures.