Even if you’ve never embarrassed yourself by unknowingly spreading an urban legend as fact to friends and family, you’ve at least been on the receiving end of one of these misinformed messages. Next time an email, tweet, or link seems a little fishy, here’s how to spot it before your itchy trigger finger sends it to all your friends or followers.
http://fluency21.com/blog/2014/03/17/how-to-avoid-spreading-myths-and-misinformation-online/