The most disruptive thing about Gmail had @&$@ all to do with user features. It just needed to be "good enough".
The key feature of Gmail was scale, which allowed it to offer much better spam detection, which allowed it to capture more market share, etc.
Facebook mobile is the idea that you have something (Facebook) that was popular somewhere (PCs), that for strategic reasons (TAM / global penetration, location-targeted advertising) pivoted to a completely different medium, and invested non-trivial company resources in making that happen.
The iPod/iTunes were pretty damn big. And specifically, big in demographics that were ideal iPhone customers. Apple in 2007 was very different than Apple in 1997.
The key feature of Gmail was scale, which allowed it to offer much better spam detection, which allowed it to capture more market share, etc.
Facebook mobile is the idea that you have something (Facebook) that was popular somewhere (PCs), that for strategic reasons (TAM / global penetration, location-targeted advertising) pivoted to a completely different medium, and invested non-trivial company resources in making that happen.
The iPod/iTunes were pretty damn big. And specifically, big in demographics that were ideal iPhone customers. Apple in 2007 was very different than Apple in 1997.