Tech stocks plunged on Friday as Amazon shares had their worst day since 2006 

Nasdaq composite plunged 4.2% to finish worst its month since 2008 crisis

The Dow dropped 939 points in a broad selloff to end the month of April 

Losses for technology stocks accelerated on Wall Street Friday, pushing the Nasdaq composite to its biggest monthly loss since the 2008 financial crisis. 

In a day of brutal selling, the Dow Jones Industrial Average fell 939 points, or 2.8 percent, ending April down nearly 5 percent for the month.