Ben Ling boomerangs from Facebook to GoogleWhere's Ben Ling headed next? We hear he might be headed back to Google — not a startup. Ling, a talented product manager, is closely watched as a talent barometer. His defection from Google to Facebook last year kicked off a series of trend stories about people leaving Google. Less than a year on the job, he's leaving Facebook, which has kicked off another series of trend stories about people leaving Facebook. Ling was recently spotted having lunch in Mountain View. You know what this means: A series of trend stories about ex-Googlers returning to the Googleplex. Update: Kara Swisher confirms Ling is returning to Google, tasked with figuring out how to make money off YouTube.