When browsing posts, it's far too easy to click the back navigation button on my device which currently takes me to the Communities page. The problem is, once you move away from the Posts page there doesn't seem to be any way of returning to your previous place in the Posts page.

This could be solved a couple of ways:

1. Disable the device's back navigation button from moving you away from the Posts page.
2. Have some method of remembering and returning your the previous place in the Posts page.