LiveIntent, a New York startup backed by First Round Capital and Battery Ventures, has been running a beta on Phiily.com. A box on the righthand sidebar of Philly.com sections reads "Philly.com twitter recommendations". Place your cursor over it, and a box will open up over towards the center of the page showing a scrollable list of recommended twitter feeds.
Right now, these mostly appear to be Philly.com journalists, First Round Capital execs, and promotional twitter accounts. LiveIntent, which raised $4.25 million from First Round and Battery, was discussed in this Wall Steet Journal blog last week on the challenges faced by Twitter's attempts to expand its control over its ecosystem.