"A factoid is a questionable or spurious (unverified, false, or fabricated) statement presented as a fact, but with no veracity. The word can also be used to describe a particularly insignificant or novel fact, in the absence of much relevant context. The word is defined by the Compact Oxford English Dictionary as "an item of unreliable information that is repeated so often that it becomes accepted as fact".
Factoid was coined by Norman Mailer in his 1973 biography of Marilyn Monroe. Mailer described a factoid as "facts which have no existence before appearing in a magazine or newspaper", and created the word by combining the word fact and the ending -oid to mean "similar but not the same". The Washington Times described Mailer's new word as referring to "something that looks like a fact, could be a fact, but in fact is not a fact".
Factoids may give rise to, or arise from, common misconceptions and urban legends." - Wikipedia