There are two kinds of people that affect positively, "and another affects negatively", so we must be warning of the second type in order to secure their evil, especially by children, because they are vulnerable to them, and awareness and not to walk towards them to avoid falling into the mess
It seems a ridiculous notion to spend hundreds of hours watching young people do stupid stuff. Yet, many people -even older "adults"- do just that. I know somebody that showed me a couple high school boys she enjoyed watching for their antics. From advertising, those two boys bought a million dollar house for their parents. That is a little bit more than I made building fences, designing & maintaining landscapes and working in restaurants at that age.
As for how much influence they wield, when Obama occupied the White House he invited many of the more popular youtube celebrities for a visit. These are young people, mostly with no education past high school, no achievements or family connections. Their only claim to fame is attracting attention on an internet video system.
So how might a person wield influence via youtube? It is a video community not linked by geography, but by electrons. Bringing stories to the attention of people can manipulate their thoughts and actions. Thousands of videos infest that system loaded with lies, simply because people seek attention and the lies often gather it.
Some truly great people inhabit that system. They travel to interesting places and give you video tours and interviews with people you cannot easily & economically encounter yourself. Others give expert advice on mathematics, sciences, automobile repair, arts & crafts, construction techniques, gardening and much more. Used properly, YouTube is an excellent tool and I highly recommend it for sharing information, especially of the how-to variety. For University Extension Agents, there are few tools better suited for sharing scientific research results and for teaching better techniques.
I hope my long-winded reply was useful in some way.
There are two kinds of people that affect positively, "and another affects negatively", so we must be warning of the second type in order to secure their evil, especially by children, because they are vulnerable to them, and awareness and not to walk towards them to avoid falling into the mess