(Fast Company) — Those rumors about Google‘s Facebook-rivaling social network just got a whole lot more interesting. A former Facebook exec has been quizzing contacts inside Google and discovered that it’s all real, with large numbers of Google staff busy on task. The leak comes from Adam D’Angelo, cofounder of Quora (a cloud-sourced community question-answer forum), and it’s interesting as he was formerly chief technology officer at Facebook. Given the size and complexity of Facebook’s operations, this was no small job, and probably places D’Angelo on the contacts directory of a significant number of colleagues in competing high-tech businesses. In other words, when D’Angelo says he spoke to “reliable sources,” we’re inclined to believe him.