National & World News:
In the hours before Facebook's stock began trading on the Nasdaq Stock Market for the first time, CEO Mark Zuckerberg reminded the company's 3,500 employees not to get caught up in the hoopla surrounding its long-awaited initial public offering.
Hundreds of protesters broke away from a large rally and began marching through Chicago streets Friday, taunting police and shouting about everything from bank bailouts to nuclear power — a prelude to even bigger demonstrations expected after the start of a NATO summit.