the phenomenon of a popular trend attracting even greater popularity
As Barack Obama found during his US presidential campaign, when it comes to generating a "bandwagon effect", the internet is hard to beat.
BBC
(Feb 10, 2010)
In our context, the bandwagon effect is a technique used by propaganda films to increase the popularity of a particular viewpoint.
But flag waving and the bursting forth of sentimental oratory mean nothing, really.
MacQuarrie, Hector
In our context, flag waving is a propaganda technique used to convince the viewer that agreement with a certain point of view will make one more patriotic.
“Trophy Wife” suggests that “former party girl” Kate is a stereotype.
In our context, this technique attempts to arouse prejudices in an audience by labeling the object of the propaganda campaign as something the target audience fears, hates, loathes, or finds undesirable.