Google's stock clobbering shows just how freaked out Wall Street is about the online ad business right now (GOOG, GOOGL)

Google shares finished down for the second day in a row following mixed earnings. 
Even an analyst who trimmed his price target called it an "overreaction."
One analyst said those selling Google may anticipate bad news coming from Facebook's quarterly report on Wednesday and wanted to avoid fallout to ad sector. Google continued to feel the backlash on Tuesday of a Q1 financial report that featured some unwelcome surprises.
The share price of Google's parent company Alphabet Inc finish