This is something that Facebook and ad-serving companies should be fully transparent about. * Who is paying for their political propaganda? * How much was spent? * What were the ads? * How was it paid? Not being able to track ad spending by political parties, governments or individuals opens opens a huge opportunity for political corruption.
Okay, but why? Are you implying that it gives people some sort of advantage? If so, how is it any different to all the myriad other things that people could do that can effectively push or platform a campaign/political opinion? E.g. Biased reporting, speeches, skilled orators, organized rallies and their funding, etc.
And also, what is your definition of "political corruption"? Also, how is all this different to "campaigns", activism and general spending that is targeted at altering public opinion at the early childhood level? I.e. at primary and secondary schools.
I guess where I'm getting at is where do you draw the line, if any. We are, after all, part of a democratic society and one of the big supposed benefits is that it's marketplace of ideas where the best one effectively gets translated by the elected officials. Advertising/promoting such ideas should be part and parcel of such a marketplace.
Personally, I draw the line at propaganda and such aimed at developing minds. Till the past decade, I'd say the biggest movement that was doing this was the climate/pollution one. It's been heavily promoted and pushed at children way past the point of trying to foster environmentally-conscious and behaved adults that understand the consequences of some of their actions on the environment.