YouTube is probably the best and mostly known media website in the world.
This is the first reason why it cannot be safe and trusted, mostly for non-english users. YouTube is a unique platform for monetization and video blogging (or just getting known from bottom), offering many possibilities for companies or individuals, THESE FACTS make this video hosting completely unsafe.
YouTube.com shows annoying ADs to you, half of them are static banners from Google, other ones are ad videos - such content is cheap, not controlled by anyone in any way.
You may find dangerous content inside hosted videos and POPULAR channels, including adult content,drugs, or just hidden ads/promotion of things you dont actually need.
YouTube says to you - what you actually have to like, it makes impossible for you to correctly rate videos, because only opinion of masses become visible to those one, who just discovered the video or channel.
Uncle Sam should thank YouTube - for being one of few places in the internet, where political protest moves appeared, and lead to casualties and wars (remember egypt, lybia, syrian rebel-terrorists with their lie contents regulary uploaded to various channels). Thank You with your propaganda!
With all bad things, YouTube has better sides, like completely free hosting and access for your followers to watch your videos. If you are not an idiot.
I'm revising this comment to better reflect what is going on.
The negative aspects are mostly contained to the comments. BE CAREFUL CLICKING LINKS IN THE COMMENTS! Shady accounts fake "Read more" links to lead to shocking videos, among other things. I've heard reports that people linked malware, as well, but I haven't found such links myself.
Beside the links, the most bothersome aspect will be the overwhelming spam. People are posting entire Harry Potter books in the comments. There is no limitation on length, so ASCII art is fair game.
There is a large amount of language that could be deemed inappropriate. While not all the videos are inappropriate, there is no rating system in place for most channels and any children that are not allowed to watch content from (as a general rule) PG-13 to R should have certain channels approved to watch.
Definitely not safe for children unless there is adult supervision since a lot of the videos will contain sexual material and bad language. Some people get away with posting porn, yet others get censored and banned for voicing their opinions. Though youtube has a report button for people who promote hate speech and intent to inflict violence, sometimes youtube favors these people and do not remove it, especially if they make a lot of money through adsense. I've also witnessed many videos promoting pedophelia and after convincing a large group of people to report the video with me for a better chance of removing it, they never took it down. Also, as being a member of adsense through making videos on youtube, many of my videos have been removed for copyright when I had absolutely no pieces of footage that violated copyright rules, unless my face and my voice has a patent on it I don't know about. Youtube will often times ignore your disputes for false copyright removals and other times when someone has copyrighted your own videos, they wont do a damn thing and don't give a crap about you. It's good for watching videos, but as far as having an active account, not so great.
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