Tablet computer usage is exploding, with one in every four U.S. smartphone owners reporting using tablets during the three-month period ending in April. \"Tablets are one of the most rapidly adopted consumer technologies in history and are poised to fundamentally disrupt the way people engage with the digital world both on-the-go and, perhaps most notably, in the home,\" Mark Donovan of comScore, which conducted the study, said. \"It\'s not surprising to see that once consumers get their hands on their first tablet, they are using them for any number of media habits, including TV viewing,\" he told mediapost.com Tablet adoption has skyrocketed since the launch two years ago of the iPad, the first tablet with meaningful market penetration, smartCom said. Upper-income households were most likely to include tablet users, the study found. That was likely a function of the high price point of these devices, still considered luxury goods to many consumers, smartCom said.