Facebook Mail : Facebook are absolutely rampant at this point.
This has got to hurt Google (and Microsoft). Leveraging Gmail is still Google's best hope of getting some kind of successful YASN off the ground. If FB can puncture that, then Google's fails in this area may start to look as tragic as Microsoft's floundering in mobile-land. (Basically Google would have to buy Twitter to stay in the game.)
The Future of Shopping is Mobile (Infographic)
3 hours ago