According to new data from research firm IDC, Apple held its second place spot in the worldwide smartphone market in the fourth quarter of 2010 amid strong market growth overall. Nokia maintained its overall lead in the smartphone market, with 28.3 million units shipped in the fourth quarter and a 28 percent share, down from its 38.6 percent share of the market in Q4 2009. Apple’s market share actually remained flat year-over-year at 16.1 percent…