Stock Markets

I don't have in-deep knowledge of stock markets as an economist but I still know more than enough. In past one month, Google (whose stock never seemed to go down) has fallen by around 20%. Are the markets really in trouble?? Few weeks back, citibank reported one of their biggest loss in history and are raising money to save their soul.

Last month Curve for Google's Stock Value (From 700 to 580 USD)