As another young enthusiast (although not as young as the 12-year-old
who is being discussed), I appreciate that the tenor of the discussion
is how to politely tell off the offending posters without destroying
their interest.

I agree with most everything that's been said.  I just wanted to write
that I don't think simply deleting incorrect comments is the way to go,
only because an incorrect statement allowed to remain uncorrected will
remain in people's minds, deleted or not.  I would simply leave a comment
on the comment, which I believe is possible on YouTube, providing the
correct information and thanking the viewer.

The particular 12-year-old is some kind of tiresome, to be sure.  In
addition to his crazy spelling and grammar, he has committed other
misdeeds such as re-posting videos which do not belong to him and using
music downloaded from the Internet which also does not belong to him.
This is to say nothing of the way he interacts with others, especially
when corrected.  However, he is also very interested, which is
something at least.

Whatever else, if he really is 12 years old (or perhaps younger, it
has been suggested), then he really oughtn't have a YouTube account.
I think that, according to law, children under 13 are not permitted to
register on sites with user-generated content like YouTube, message
boards, and so on.  These restrictions were designed to protect
children from sexual predators, but, if they were enforced, they might
also have saved us some annoyance if they'd kept this young man away
until he was more mature.

TJ Fisher
Washington, DC, USA