"Just because you wrote it doesn't mean you know what your site is for."
-- Maciej Cegłowski, "Fan is a Tool-Using Animal", 2013-09-06
(If you want some context, the paragraph immediately before what I quoted above is, "Which leads to the next point, 'shut up and listen'. People are using your sites in ways you might not understand. Why not have a look and see what they're up to? Or ask? People are amazingly forthcoming when you ask them, but it rarely occurs to site owners to do this." I you want more context than that, of course you can click the link and read the whole thing.)