viewbooks and letters

<p>Who do colleges send out their viewbooks or letters to?</p>

<p>Do they look up students on collegeboard and send them out to students who are in the possible sat score ranges? Or do they only send them out to students who join their mailing list and request for information?</p>

<p>I've been getting a few of these lately. Not that I think they have anything to do with my chances of admission to these schools, but I'm curious.</p>