S&P 500 losing streak runs to eight days as Facebook weighs

The S&P 500 fell for an eighth straight session on Thursday, its longest losing streak since the 2008 financial crisis, as Facebook shares weighed and investors grappled with uncertainty over next week's U.S. presidential election. Facebook shares tumbled 5.7 percent as the world's largest online social media network warned that revenue growth would slow this quarter. The stock was the biggest drag on the S&P 500 as well as on the tech-heavy Nasdaq, which also posted its eighth straight