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https://www.commonsensemedia.org

If you go for Roblox, I recommend using the parental controls to enable curated games only. It wasn't on by default for my <13 yo, which annoys me to no end. If you don't turn it on, you'll end up with your kids in games with freeform sketching and all sorts of questions you weren't planning to answer until later. :-)

> related: is there some resource to know what a game/social network concerns may be?

If you search for "roblox parents" you'll find several good resources.

I have always used https://www.pluggedin.com/

It's run by a Christian org but to their credit they seem to be the only group that actually cares about what kids see and hear in movies and tv. And they cover the most popular movies and tv really quickly.