San Francisco-based advertising retargeting firm AdRoll said today that it has acquired Bitdeli, a fellow San Francisco startup. Bitdeli develops a "big data" analytics software platform for business dahsboards. Financial terms of the buy were not disclosed. Bitdeli was founded by brothers Ville and Jyri Tuulos. AdRoll is venture backed by Foundation Capital, Accel Partners, Merus Capital, and Peter Thiel.