techcrunch.com — Chalk another one up for the mobile revolution: There were 56 million tablets purchased worldwide in 2011, but a new report from Forrester Research predicts that number will explode in the years ahead: its researchers say that there will be 375 million tablets sold by 2016, representing a compound annual growth rate of 46 percent, and that by 2016 there will be 760 million tablets in use overall.