My favorite verse in my favorite node, 1st Monasterians, is an injunction to teach with links:

Do not rebuke them with harsh words such as "RTFM",
but rather lead them gently - with URLs - so that they
may learn wisdom.

I don't know why I find the little "with URLs" parenthetical so hilarious. Maybe it's its soooothing sound (if one makes it rhyme with "curls"). Or the off-beat association between gentleness and URLs. But when one thinks about it, this association is not as whacky as it may seem at first. Offering a link is both useful to the recipient, and quick for the offerer, without coming across as curt; after all, the offerer took the extra trouble (however tiny) to make a link to something presumably useful. It is, ultimately, a simple friendly gesture, even if many of us now do it automatically (like so many other friendly gestures); I am glad that it has become a "local custom." It is one of the many things that help set the tone for the place.

Incidentally, I'd be hard-pressed to cite a node (including anything in the site docs) that does a better job of conveying the essence of PM than 1st Monansterians.