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I like veen's thoughts. To add some more: how about being able to set a profile image, and if you hover over someone's name for > 1 second, a little 180x180 profile image pops up. (greater than a second so it doesn't pop up while you're mousing through a page.) Furthermore, how about a popup box when you click someone's username that has all of the info that normally appears in the left column of the profile page, so you can view someone's info without leaving the current page. You could then click their username from the popup or something to view their full profile with posts, shares, comments, etc. This would be similar to how the Twitter webpage (not mobile app) works when you click on someone's name.