Back button on mobile version

I'm not sure about IOS but for android systems, the mobile version is really hard to go back from viewing profiles and other pages. It also hides our system 'back, home and app list' buttons from view so it's difficult to access our default back button.

I think putting a back arrow/button at the top of the screen similar to twitter's would make it much easier to navigate the site for those of us that also check this via our phones or tablets.

Thank for considering it!