The episode of the Yahoo/Ford series “Plugged In” that features celebrity chef Rocco DiSpirito talking up Boston is online as of this week. The local segment features DiSpirito sending “Plugged” contestants all over the city to visit his favorite Boston landmarks, one of which is his own alma mater, Boston University, where he assisted Julia Child. “Plugged In” is an ongoing Internet show that has celebrities sending competitors to complete tasks around their favorite cities in order to win a Ford Focus Electric. Boston’s episode was filmed in May. Finalists from each episode will compete in Los Angeles in August.