I am greatly aware of this but there are differences in setting that make searching a bit more difficult, which I've been trying to point out for several posts now. I'll paint one last verbose picture of how I view the scenario and bow out of discussion in this thread, as I think I may've gotten to the point where I'm hurting my view more than I'm helping it. Braer Poet has punched the Tar Baby. >_<
When you come to a forum with a question or problem, you usually already know quite a bit about the situation and can describing in a way that somebody else who may've asked priorly already has. You have the prerequisites to use the search function already, which is there and there for a reason. Similarly if there are FAQs you can check to address your problem, all the better. Having two duplicate topics about the same thing on a forum is a waste of space. That is assuming your question isn't super simple, to the point where your lack of descriptiveness makes it unintelligible spam that nobody can help you with.
When you stumble upon something cool like Touhou on Youtube or a picture on a site, suddenly you're at a loss for words to describe it. There is no intelligible way to describe it. For various reason, one may or may not see things that stand out about the topic which can either help or befuddle people further, making it akin to a tech unsavvy individual reading a VCR manual. The conversatory atmosphere in Youtube comments is also a lot more lax, changing the definition of spam. This is because neither informativeness or text discussion are the site's main purpose and there are no official forums to socialize in. In a terse and informal social entertainment setting, are we to expect everyone to watch multiple videos, checking the tags of each to find common links like a scholar, before they can ask a simple question to people who likely already know? I'm not sure how others feel but I personally feel this is a bit overly expectant of the average Touhou newbie.
Long story short, I believe it all boils down to the context of the setting. The less information you're initially provided with, the more understandable the question is. Likewise, the less self-evident it is, the more understandable. YouTube's about a medium on both accounts I'd estimate. Also on this particular note, the question phrasing is also a part of the context as I believe "What is Touhou?" should be a far more self evident question than "What anime is this?" due to the uniqueness of Touhou as a series name/word. That's all I think I can say on the matter, later guys.