Adnormal?

One of the things I've learned about recently, while building a website, is advertising.  I've learned that a lot of internet advertising (ads by Google, for example) is contextual.   Google use the words that are on the page to determine which advert to place there.  Today, I wrote about dancing, and dancing related adverts appeared on that page within seconds.  Another popular form of advertising is behavioural targeting, as used by Facebook, in which contextual advertising is further refined by using data from the user's past click-stream (ads that they have clicked on).

These are all adverts that have been targeted specifically at me.  I am perplexed.  Does anyone else have an advert profile as strange as mine?

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