Comment: Might be a bit outdated now, haven't looked into it lately

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In reply to comment: I see that coming up OFTEN (see in situ)

Might be a bit outdated now, haven't looked into it lately

"Example - the following entry 127.0.0.1 ad.doubleclick.net blocks all files supplied by that DoubleClick Server to the web page you are viewing. This also prevents the server from tracking your movements. Why? ... because in certain cases "Ad Servers" like Doubleclick (and many others) will try silently to open a separate connection on the webpage you are viewing, record your movements then yes ... follow you to additional sites you may visit."
http://winhelp2002.mvps.org/hosts.htm