There's a more general addon which detects and disables tracking called Ghostery: http://www.ghostery.com/
It's stated reason for doing this is to improve page load times, which it certainly does, but it does just as well to protect your privacy.
https://chrome.google.com/extensions/detail/hgiihiookhijpbha...
EDIT: It appears to work nicely in tandem with this ghostery thing.
I'm all for a transparency and control, but this has to be more effortless--a side-effect of something users would be happy to do anyway--especially for the average user if it is to be successful. I believe a social media aggregator can position themselves to do this. Facebook knows certain things about me, Twitter others, Google others, etc. What I surf online isn't always indicative of my true interests.