Facebook (FB +6.2%), which posted big gains this week thanks to favorable comments from Mark Zuckerberg (I, II) and Ben Bernanke, has seen the rating for its iOS app jump from 1.5 stars to 4 since a major update was provided last month. Baird claims the update, which delivered a huge performance boost by abandoning HTML5 in favor of native iOS code, had produced a doubling of news feed story views. Hopefully for Facebook, mobile Sponsored Stories views have grown at a similar pace.