According to new data from IDC, the iPad saw its share of the tablet market slip in the fourth calendar quarter of 2011, despite selling over 15 million units. IDC’s Worldwide Quarterly Media Tablet and eReader Tracker claims that Apple’s iPad, which saw shipments of 15.4 million units during the period, faced increased competition in the space, most specifically from Amazon, which shipped 4.7 million Kindle Fires. Based on total worldwide…
