It’s been said the best way to get answers promptly online is to provide an incorrect one. Maybe a strategy to overcome the attention span issue would be to open a sockpuppet account to intentionally seed misinformation until someone catches it and feels compelled to respond?
But to aulin's fifth point, often you won't get answered with the correct information. Instead you will get "corrected" with the local mythos, as the most repeated answer to a question usually becomes the preferred knowledge of a group.