iGaming Business – Social gaming company Zynga has announced it is to shed 15% of its workforce this year after suffering a drop in year-on-year turnover during the year ended December 31, 2013. The firm posted revenue of $873.3 million (€645.3 million) for 2013, a significant drop on the $1.2 billion recorded in the previous year, but also announced a takeover of UK games developer NaturalMotion. The full-year results were not helped by a disappointing fourth quarter in which the firm posted revenue of $176.4 million, which was also down on the $311.2 million achieved in the corresponding quarter in…