[EnderMB]

The problem I see with the Android market is that there tends to be far more competition. You state that no one has stepped up on Android, however there are a number of decent apps that do exactly what's needed, and Readability have already launched on Android to some success.

Android users are often aware that they're missing out, but there is always something to fill that void. As a result, their users have a siege mentality towards their platform and the businesses that ignore them. As Instagram is likely to figure out when they (finally) move to Android arriving late to the Android game could be fatal to the perception of their brand.