I wonder how often if ever extreme groups eager to recruit use the ads served to them as a source of potential "proto-shibboleths" to look into. If the advertis

I wonder how often if ever extreme groups eager to recruit use the ads served to them as a source of potential "proto-shibboleths" to look into. If the advertisers with their dearth of data could know, before even you do, what sort of stuff people like you tend to like, you could use them as a bleeding edge to go to events/locations associated with that thing to meet fellow sympathizers who could potentially be activated, or unmet fellow activists who just happened to be around.