"Nielsen, the ratings company, have conducted a survey of the most popular apps across a range of mobile OS platforms. The results make for interesting, if somewhat unsurprising reading. Facebook comes out on top across all platforms surveyed as the most downloaded application used with one glaring exception; Android. It does manage to muster a pretty convincing second place on Android, but is a good bit behind Android's most downloaded app, Google Maps. On the iPhone and Blackberry platforms Facebook reigns supreme, indeed Blackberry Facebook downloads make it the front runner by a wide margin and in a reversal from the Android stats Google Maps is beat into second place pretty convincingly. You can check out the positions of different apps for yourself in the chart." via mobile-review.com