I am not totally against targeted advertising when I am being targeted based on my activity on that site, but I find it really creepy when ads are targeted based on things I've done outside of the internet, or conversations I've had. I don't like the idea that my activity unrelated to a specific site is being stored somewhere and sold to companies that could theoretically use it for whatever they want.

I don't mind supporting companies by not blocking ads on a page, but I do mind being "followed" by them around the internet and IRL.