Facebook leads tech gains; Microsoft slips By: MarketWatch August 26, 2013 at 10:48 AM EDT Social-networker hits another 52-week-high while Microsoft dips in the wake of CEO Ballmer’s retirement announcement. 3D printing stocks jump on report. Read More >> Related Stocks: 3D Systems Corp Adobe Systems Altera Corp Amazon.com Apple Facebook Groupon Cl A Hewlett-Packard Microsoft Netflix Oracle Corp PHLX Semiconductor Sector Index Seagate Technology Plc Stratasys Ltd Vmware Inc Yelp Inc