Apple's iPad tablet has high a five-month high in terms of web interaction by North American users, reports mobile advertising firm Chitika, with the next two groups of rivals -- Amazon's Kindle Fire and Samsung's Galaxy tablet models -- far behind. While the iPad platform dropped slightly in April, the report from May shows not only a return to form but surpassing its previous dominance, to a level not seen since Christmas, 82.4 percent. Combined, all the tablet rivals to the iPad have less than 18 percent share in real-world usage stats.