Bandwagon
Also called: Appeal to popularity, Ad populum
Claiming something is true or good because many people believe it or do it.
How to spot it
Is popularity being offered as the only reason?
Example
“Millions of people use it, so it must be good for you.”
How to answer it
Ask what the evidence is, apart from the headcount. Many people have been wrong together before.
Related
- Appeal to tradition: Claiming something is right because it has long been done.
- Appeal to authority: Treating someone's title or fame as proof, instead of looking at their reasons.