It started last week. Facebook invited The New York Times' tech blogger Nick Bilton to witness the next version of the company's mobile app, which will be available sometime this summer. Bilton discusses how -- despite being one of the most popular apps in Apple's ( AAPL) App Store -- the current app's slow speed is maddening most users. Bilton explains that the reason for this is that the app heavily relies on HTML5. The new one is built in "Objective-C." The takeaway for readers and Facebook mobile users is: Don't worry -- we've got a bead on this. Today, I read a fascinating piece by Mike Isaac in All Things D where various Facebook folks articulate to him how well-thought-out their mobile strategy is. This all comes straight from the top apparently (when doesn't it at Facebook?). There are all kinds of assurances that well-qualified people have stepped into the gap left by the departing CTO.