Actually I think this is a very significant concern.
I am surprised that Doubleclick or someone similar has not already been
subpoenaed in a civil case for some cause or other. If I were a plaintiff's
attorney in, say, a sexual harassment/hostile environment case, I would seek
a record of any hits logged by those companies. Ditto if I were fishing for
evidence in a stockholder suit. It's impossible to depose 10,000 separate
web sites to see if someone has his any of them - but if only two or three
companies can be queried about the same activities... It makes for short
work, and is certain to turn up enough of a "silicon trail" to make
*someone* uncomfortable.
Because of this possibility, I know of several administrators who simply
block, at the DNS level, about two dozen domains. Doubleclick, imgis,
preferences.com, focalink, flycast.. those are the first ones that come to
mind.
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