A "factoid" is not a "small fact", it is "something that looks like a fact" (cf. 'android' or 'humanoid'). A better word for this kind of small fact would be "factlet".
The other definition of "factoid" (OED's "brief or trivial piece of information, esp. any of a list of such items presented together") is literally the only usage I have encountered for the word in the past 40 years.
Or fight back! Sometimes successfully. Popular usage is not immune to deliberate attempts to change (or freeze) the language. Prescriptivism is thus a subset of descriptivism.
