Mobile and Web are two different channels , Our first focus is to utilize web channel with webcam that is easily available. Mobile would be awesome no doubt.
Its true commitment of Zuckerberg and an example of leadership .What I learned from Zuckerberg :- Few days ago,I reached to an Indian VC for seedfund,I told him Sir I have two apps with business plan and demo then I have shown both apps, He told me you apps are good but I really scared to invest on app, I was surprised!, I asked "Whats your concern sir", He told me , If you have two apps, then might be after few months you'd have 2 more apps. He gave me this example of Zuckerberg, build and follow one path till your app won't die. And its up to you what you decide.