Are you an idiot? Because you must be, since advertising is very influential. The entire global economy revolves around it. Every single dollar revolves around some form of advertising.
It must cause your head to explode when you find out people actually BUY newspapers and magazines BECAUSE of the ads, or when they watch random teams in the Superbowl BECAUSE of the ads...
Don't be a douchebag libertarian narcissist that thinks their lives are above influence by others.
"I am so awesome that advertising has no effect on me."
Introverted libertarian narcissist geeks such as yourself are the worst. Your narcissism prevents you from understanding how the real world operates, where advertising is actually DESIRED, because people are interested in other people's lives, and becoming like those people.
Unlike you, where you're stuck comfortably in the awesomeness of your own life, but you don't know about your low social status, or complain about how other awesome people are actually somehow not awesome? hah.
Given all that, social media advertising itself is a terrible concept, because it goes against the basic nature of how advertising and marketing and marketing works. Mainly, the rule of life that says people want to associate themselves with people more powerful than themselves.
Why would a brand place their ad next to a picture of your friend from high-school throwing up, when they can place their brand's ad next to an awesome picture of Kate Moss in Vogue? Or next to an awesome sports figure on ESPN (the most valuable media property in the world)?
If you understand that, THEN you understand how advertising really works, and how influential it actually is. Understand this rule, and you can pretty much make any brand.
Of course, the libertarian narcissist douchebag doesn't understand that other people are higher power than them (because obviously their narcissistic disorder causes them to think they're just too awesome themselves) so this basic fundamental of advertising flies right over their head.