This is interesting, but looking at the NYC one, your "Xpert Tweeters" really distort the idea of "local".

I'm seeing tons of national news from the WSJ, the NBA, and a score of other media outlets that are based in New York but not covering New York (aside from incidentals, e.g., that Wall Street is a street in Manhattan).

Also, as you expand, it might be worth while to drill down NYC by borough. Having a Brooklyn, Manhattan, Queens, and even Hoboken NJ page would probably be worthwhile both for your users, and for you.