You’re grossly over-estimating the average intelligence (and willingness to actually stop and think for a minute) of those accounts’ target markets.

I have friends who spend pretty much their entire lives on FB and Insta and they would swallow anything from there... last time one was surprised when I told her a watch she saw advertised on FB with a huge discount (300£ to like around 39£) was never at 300£ in the first place.