Want to know why traditionally PC-centric companies like Microsoft are pouring so much energy into their mobile efforts? Look no further than China, which now says that more of its residents are getting online with phones and tablets than PCs. Of the 632 million internet users recorded this June, 83 percent (527 million) were using mobile devices at least some of the time; meanwhile, 81 percent (512 million) hopped on using computers. Internet adoption was almost exclusively driven by ultra-portable gadgets, in fact. While overall internet use grew about 2.3 percent in the space of half a year, the number of mobile surfers jumped by 5.4 percent. The growth pattern suggests that many first-timers don't have a PC at all -- whatever's in their pockets may be the only way they connect to the digital world.