Facebook.

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I am a regular user (and have been for over 10 years). I see very few ads and have never had an Fb e-mail.
Invaluable IMHO for staying in touch with friends overseas.
Also I see few ads as I provide feedback (usually negative) when I actually get any!

I've been on it for about 13 years but haven't really done anything apart from exist on it and look at it sometimes for the last 5. If I google something, there will definitely be an advert for it on Facebook within the hour. Can't say I receive emails but I think the email I signed up with is dead now