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I agree to an extent. I understand your analogy but I think there's a crucial difference between ads for a product and political positions. You can easily get someone to buy a product, but getting someone to change their views on, say, abortion is much harder. Political positions are tied to identities in ways that purchasing decisions are generally not. There may be some ways to sway some people who are on the fense about a given candidate or position, but I generally think this ability to change people is way overstated. People just keep posting their opinions over and over and think it's actually changing someone's mind, more often they are preaching to people who already agree with them.