Remember the days before Facebook's iOS app ditched HTML 5 and sped things up with some native code? It turns out that there's some regret in Menlo Park about relying on the web markup language. Betting on HTML 5 for the app is "one of the biggest mistakes if not the biggest strategic mistakes we've ever made," Mark Zuckerberg said in an interview at TechCrunch Disrupt today. The firm's CEO also mentioned that new features will be making their way to the app and a snappier Android version is coming down the pike "when it's done."