Techs sink on F5, jobs; Facebook gains By: MarketWatch April 05, 2013 at 11:41 AM EDT The tech sector takes a hard hit Friday morning on a disappointing jobs report and a warning from F5 Networks. Read More >> Related Stocks: Amazon.com Cisco Systems F5 Networks Facebook Hewlett-Packard Juniper Networks PHLX Semiconductor Sector Index Zynga Inc Cl A