kagusuchi said:
I try to make sure they're not posted before but may be limited due to my unprivileged status. I try not to post "questionable" images since they're, well, questionable?
If you upload something that's already on the site, you'll get redirected to the page that's already there, regardless of its ranking, so I wouldn't worry about that. The only real exception to this is if you've an image with terrible quality (like JPEG artifacts up the wazoo), in which case it might be a good idea to hold off. Even then, though, sometimes it's acceptable; see post #167549 for how I handled such a situation.
Furthermore, I wouldn't worry about posting questionable images. If you mean questionable as in questionably explicit, it doesn't matter; I posted explicit stuff when I was a regular user. If you mean questionable as in borderline yaoi/furry/banned-from-here, use your best judgment. Don't flood the site with stuff that might not belong, but don't be shy about uploading something you think might fit.
daesgiathatch said:
But who is albert?
Albert is the guy who runs Danbooru.
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As for the issue of things not getting approved, I'd say not to worry about it. If you upload stuff that doesn't belong here, someone'll probably send you a message. Another thing you can do is hang out on IRC (I recommend #danbooru@mint.sayuri.ca since the official room, #miezaru-illuminati@irc.synirc.net, is somewhat inactive) and ask people there for thoughts on things you upload.