Please consider making the follow button change shape if you've followed the user

Right now, the difference between the appearance of the button between the pages of a followed and a non-followed user is just too subtle, and I always end up having to stare at the button for a few seconds if I don't remember whether I'm following this person - or if I'm just not sure that my click of the follow button registered.

On top of maybe changing the colour of the button, making it change shape is a much more reliable way of making sure everybody who uses the site (INCLUDING colourblind users, and I'm not even (that) colourblind myself) can tell the difference.