Some users that only use mobile wondered what the green thing top left on the avatar was.
If you are on a computer you can hover over it and see that it is an online marker. I do not think that is possible on touch screens at the moment?
I have changed this in 2.1 (not rolled out yet), though I'd note that it's probably not as useful as you might think. Given that it's very close to the avatar, it's very easy to tap on the avatar instead.
This is a really nice tweak, haven’t had any issues tapping it. On iOS there seems be a square highlighted a fraction before the tooltip appears and disappears. Not sure if it’s possible to prevent that.
Edit: it seems it does that on all the buttons and links around a post, just never noticed before. Never mind I guess.