By spooh / Getty Images A commercial plane photoshopped with the tail of a shark, hashtags that misleadingly evoke sustainability, tokenistic use of minorities to distract and to signal virtue: a Harvard report published Tuesday highlights rampant greenwashing by leading companies on social media. A commercial plane photoshopped with the tail of a shark, hashtags that misleadingly evoke sustainability, tokenistic use of minorities to distract and to signal virtue: a Harvard report published Tuesday highlights rampant greenwashing by leading companies on social media. The investigation, commiss…