Whether it serves as a chill escape from the onslaught of the real world or simply a way to beat vacation doldrums, a viral ...

A key challenge for Roblox CEO David Baszucki: figuring out how to police a user-generated content platform where many users are under 13. It's a tricky question.

They're probably on Roblox, playing "Grow a Garden," which, as I typed this Thursday, had more than 2.2 million people playing — four times as many as the next most popular game.