The public has benefitted from placing those regulations on traditional media, it should serve as an example for regulating massive tech corporations. If anything, I'm in favor of more advertising regulations on traditional media (eg banning deceptive advertising, especially in medicine).
Giant monopolies that control most of it for most users?
What is Facebook a monopoly of? Attention? Digital family scrapbooks?
If they're such a monopoly why is it ridiculously easy to quit it with absolutely no consequences?
Why are you giving these companies powers they don't actually possess? Their only value to anyone is their Network effects. There are plenty of alternatives to Facebook and Twitter and Google and (thanks, Internet!) they're really easy to find and use.