Etymology
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factoid (n.)

1973, "published statement taken to be a fact because of its appearance in print," from fact + -oid, first explained, if not coined, by Norman Mailer.

Factoids ... that is, facts which have no existence before appearing in a magazine or newspaper, creations which are not so much lies as a product to manipulate emotion in the Silent Majority. [Mailer, "Marilyn," 1973]

By 1988 it was being used in the sense of "small, isolated bit of true factual information."

updated on September 25, 2018

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Definitions of factoid from WordNet

factoid (n.)
something resembling a fact; unverified (often invented) information that is given credibility because it appeared in print;
factoid (n.)
a brief (usually one sentence and usually trivial) news item;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.