How does google know what websites I am visiting?

I recently signed up for a lot of dating websites, including Plenty of fish. Now, whenever I visit some website (like techcrunch) with google ads on it, I get this advertisement:

The question is,

How the heck does google know that I have used POF? This is outright creepy. I don't have google toolbar or any of those things turned on, so there has to be something that google is doing.


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