Snapchat-owner Snap IncSNAP.N tumbled 18.9% as it warned next quarter results could miss Wall Street targets, while Pinterest IncPINS.O dropped 13.4% after the image-sharing platform forecast second-quarter revenue growth below analysts' estimates as advertising spending declines. Still, the Federal Reserve is expected to raise interest rates by 25 basis points at its May 2-3 meeting, potentially the last hike in the U.S. central bank's fastest monetary policy tightening cycle since the 1980s. For a Reuters live blog on U.S., UK and European stock markets, click LIVE/ or type LIVE/ in a news window.