Apple leads techs down; Facebook, Yelp slip By: MarketWatch May 01, 2013 at 11:23 AM EDT Apple shares slip as bonds see heavy trades in debut. Facebook, Yelp shares down ahead of first-quarter reports, due after closing bell. Read More >> Related Stocks: Apple Brightcove Inc Cisco Systems Facebook Hewlett-Packard Microsoft NetApp PHLX Semiconductor Sector Index Yelp Inc