'A celebrity is one who is known to many persons he is glad he doesn't know' has been attributed to
H. L. Mencken cited by [
Quotes of the Day] [
The All Electric Media Weblog].
I like this epigram, although whether it was said (or written) by H. L. Mencken is doubtful. The problem with most collections of quotations, on shelf or online, is that their sources are undocumented, or cited so casually or inaccurately that they are hard to credit.
On shelf, among the few volumes which meticulously document their attributions are The Oxford Dictionary of Quotations and The Quotable Woman.
Online, Sprezzatura is among the few quotation collections which publishes carefully-documented citations.