I apologize if this has already been requested, or perhaps even added, as I have not used the mobile site in a couple months.
My idea is contrived under the understanding that there is no way to view your active and inactive places on the ROBLOX mobile website, which through the eyes of a future game developer is a little concerning.
I feel like an addition of such a simplistic nature would not be too hard to implement. It would be a great idea to give users the ability to see and/or manage their active places, track place visits, and perhaps even see the current players in their game.