I freaking HATE google / YouTube for filling my kids' childhoods with Smosh videos instead of real books or high quality active play.
And yes my son flunked out of college because of online social media - twice! He's got ADHD which makes him a perfect target for the addiction phd psychologists employed at social media and videogame companies! For these online tech vampire companies addicting your kids is like shooting fish in a barrel! And yes I'm a cs phd who got my start in network security!
As a left-wing free speech parent STILL STRUGGLING against online addiction with a 21-year old son who is STILL spending 24/7 to waste time online I'd put the threat up there with : hard drugs & gambling addiction. Yes it's that severe for a not trivial part of the population. YOU HAVE BEEN WARNED!