We're hearing whispers that Adam Bosworth, ex-Google and Microsoft engineer who created XML and the Access database, will soon join hot social network Facebook. Not 100% on this yet — Facebook PR head Brandee Barker is traveling and unavailable for comment — but the rumors seem strong and very plausible to us. If true, this sheds new light on Bosworth's swift and sudden departure from Google, where he was head of Google's beleaguered health project. The most surprising rumor is Bosworth's supposed new title: Vice President of Engineering, a position currently held by Facebook co-founder Dustin Moskovitz. Know anything more? Please fill us in.