To that end, is there anything else that would help you know better whether you want to follow that person? I have often thought that if sites like Match and E-Harmoney can pair people up for life, we can certainly do a better job of pairing people up to share information and conversation.
Damn, that's a good question. When it comes to web design I'm totally shit for brains. But I think something that might be neat (along the lines of humanodon's suggestion of expanding the 'interested in:' section) would maybe be if that was clickable (similar to how posts/shares are). Then you could see every tag the user has been active in (either sharing or posting), and how often or how much they've been active in each one over the course of time. I like the 'interested in:' section as it is but if you could click to expand it, it might give someone a better idea of what the other person is all about.