comScore says that one out of three Americans now owns a smartphone. In the three-month average period ending in May 2011, Android gained 5.1 points, reaffirming its position as the top platform with a 38.1 percent share. Apple's iOS replaced RIM as the second most popular platform, gaining 1.4 points to 26.6 percent share. With a lost of 4.2 points, the BlackBerry maker is now ranked third, its share dropping from 28.9 to 24.7 percent in the three-month average period ending in February. Unless the Nokia-Microsoft partnership proves successful soon, RIM won't have a lot of trouble sticking to its third place ranking, at least for for a while. With a lost of 1.9 points, Microsoft now has just 5.8 percent share, leaving it with a lot of catching up to do to even get close to RIM's share. Palm suffered the same setbacks as its non-Android-or-Apple peers, though it's not as badly bruised. It now has 2.4 percent share after the 0.4 points drop. Source: comScore Photo: NRKbeta / Marius Arnesen