Not a good week for Zynga shareholders, it's fair to say. At the time of writing, the social games publisher's share price is $3.06, having plunged nearly 40% following the company's announcement of its financial results for the second quarter of 2012. Revenues rose 19.1% year-on-year to $332.5m, but the company reported a net loss of $22.8m compared to a $1.4m net profit in Q2 2011. Analysts had expected greater revenues and another small profit, hence the stock-market punishment after the figures were revealed. Why did the financials fail to meet expectations? Zynga's chief executive Mark Pincus gave three key reasons in the company's analyst call.