NEW YORK (TheStreet) -- Hedge funds are fleeing Apple shares as famed short seller David Einhorn adds to the underperforming tech behemoth. Such is life for investors stuck on Apple island, as the company tries to navigate a future in the smartphone and tablet market rife with competition from the likes of Google , Samsung, Microsoft and a resurgent BlackBerry , formerly known as Research In Motion. As he continues to press a case for returning Apple's growing cash hoard to investors, Einhorn, of hedge fund Greenlight Capital Management, is adding to his investment in the iPhone and ... Read More