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I've just read an article (source - it's German, I'm sorry) which reports that Microsoft uses Skype to discover new websites (probably for Bing).

I know that Google makes use of Gmail to generate personalized advertising. Does Google also use Gmail to discover new (deep web) websites?

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That's how the ads in your inbox always seem related to your emails – Nana Thompson May 22 '13 at 15:48
Related: Does google read my email? – batpigandme May 22 '13 at 22:11
You might find this 2011 Gawker article of interest since it discusses some 'data trolling' accusations in re. Gmail gawker.com/5800868/… – batpigandme May 22 '13 at 22:16

I don't see any discussion of URL collection in Google's Privacy Policy. They only mention location, devices, logs, information you share publicly, etc.

Google already gets a ton of signals for URLs to index. Google+, for instance, is a goldmine of URLs.

I seriously doubt that Google is trawling your Gmail messages for links.

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