Web applications company Net Applications says the Apple iPhone is the world's most-popular mobile browser, accounting for 67% of all users worldwide, although Android and BlackBerry are both rapidly gaining market share. In fact, Android has become responsible for over 6% of mobile web browsing since its release in October. It also says that mobile web browsing as a percentage of all browsing is growing rapidly, although it's still less than three-quarters of a percent. [Market share chart; comparison statistics]