Tesla's Musk, Greenlight's Einhorn taunt each other on Twitter

(Reuters) - Tesla Inc Chief Executive Officer Elon Musk and noted short-seller David Einhorn mocked each other in open letters published on Twitter on Friday, trading barbs clothed in polite language.Einhorn on Oct. 30 had told his investors at Greenlight Capital that his fund had lost money on Tesla. Greenlight bet against the electric carmaker, and shares rose in the second quarter. Still, he told investors that Tesla "appears to continue to spin positive PR ahead of the safety and fair..