The people I like to follow on twitter most are those that are laser-focused on producing content related to one thing. Conan O'Brien, for example, almost exclusively tells jokes. I don't want to read his re-tweet of some fan's comment, for example. These make Twitter a lot less useful. A complement to your service would be to remove these less useful tweets from my feed, and just show in aggregate the links that were tweeted, as you currently do. I've spent very little time on Twitter; maybe this kind of service was first offered years ago.