Facebook Inc. (FB) reached an extraordinary milestone as its market cap rose above $500 billion, and it closed at over $499 billion on Friday. It is now worth more than Amazon.com Inc. (AMZN), which ...

4:05 p.m. ET — Facebook releases its earnings. The company's weaker-than-expected revenue in the second quarter pushes shares lower after the stock earlier hit an all-time high of $218.62. 5:00 p.m.