iGaming Business – Online gaming firm Zynga has reported that its Irish operation made a pre-tax loss of $50 million (€37.6 million) last year after it was hit by impairment charges. Accounts filed by Zynga Game Ireland show that the company’s revenue grew to $512 million, a significant increase on the $369 million record in the previous year. Despite the figures, Zynga Game Ireland recorded an impairment charge of $27.8 million on the investment of a Japanese subsidiary, as well as a $28.7 million on intangible assets, following the revised value of OMGPOP, the social game provider Zynga purchased in…