Yahoo, Twitter weigh on techs; Zynga rises By: MarketWatch April 11, 2014 at 10:28 AM EDT The tech sector is in the red again early Friday, weighed down by falling shares of Yahoo and Twitter. Read More >> Related Stocks: Amazon.com Apple Cisco Systems Netflix PHLX Semiconductor Sector Index Twitter, Inc. Yahoo Yelp Inc Zynga Inc Cl A