evidence: A Facebook post claims that founding father John Adams said, "If we do not lay out ourselves in the service of mankind whom should we serve?" There is no evidence that Adams authored this saying. It was actually a penned by his wife Abigail Adams in a 1778 letter. [...] Though he spoke and wrote widely on a variety of subjects, Adams did not author the quote attributed to him in the Facebook post. A search of his writings turned up no similar or matching phrases. (RELATED: Did John Adams Say, ‘One Useless Man Is A Shame, Two Is A Law Firm And Three Or More Is A Congress’?)