Apple held onto the No. 1 slot among all tablet manufacturers worldwide, but its share continued to slip in the second quarter of 2013 as Samsung, ASUS, Lenovo, and Acer all saw triple-digit gains. Apple Dominates Top 5 Despite Decreasing Shipments According to market research firm IDC, for the three-month period ended June 30, 2013, Apple's unit shipments dropped to 14.6 million tablets, off 14.1 percent from the same period last year. The company's market share plummeted more severely over the same period, from 60.3 percent in 2Q 2012 to 32.4 percent in 2Q 2013. Nevertheless, Apple shi...