Facebook became a native iOS app, giving users a quicker and more responsive experience. And while Zuckerberg said that a native Android app for Facebook would be coming soon, he also said that "it will be ready when it’s ready."
At the conference, the founder of the social networking site admitted that Facebook made a mistake with its mobile app and relied too much on HTML5 instead of just going native. He noted that much of the infrastructure used on the iOS version of the app will be used on the Android app. Facebook seems to be focusing on mobile and more of its employees are going to be working in that area. It's a strategy that has been paying off for YouTube with over 1 billion daily video views shown on a mobile device. The bottom line there is the money coming in from mobile ads which is something that Zuckerberg would like to see Facvebook more involved in.
source: TheVerge via Phandroid