Should Divisions be displayed?
Personally I think there is a great opportunity here to have a user's division displayed next to their name. Specifically for sub-communities such as "Gameplay & Strategy" it would be extremely beneficial to know whether I am in a discussion with a Diamond I player or a Bronze V player.
I am aware that this could cause some problems in that people won't respect what Bronze V players say, but, to be honest, should they? Obviously division means nothing in most of the sub-communities, but in Gameplay & Strategy I think it really does matter. If there is a discussion about team compositions or lane matchups I would definitely trust the opinions of a Diamond player over that of a Bronze.