This is an awesome idea, and like others have said, props for thoughtful permissions management.

Oddly though, I found that the prolific tweeters were the ones I wanted to see, and the infrequent ones were less interesting. I have a core of prolific users (none of whom I have met) that I follow because I like their content, and then an outer constellation of people I follow because I know them. Tweets from the former actually have a better signal-to-noise. Is mine an unusual usage pattern for Twitter?