After Zynga (ZNGA) went public, the frenzied optimism around this company burst, and shares plummeted. However, now that the stock is trading at extremely affordable prices, is it ready for a rebound, or is this one to avoid altogether? In this video, Motley Fool analyst Andrew Tonner discusses a key number for Zynga: paying users the company has. That number, says Andrew, is very low, and revenue growth at the company is slowing.