This is precisely why I have just deleted my Facebook account - goodbye pseudo-friends. Facebook planting cookies on my PC - even if not as member - and tracking the websites I browsed - was the last straw. This is especially since, whilst I do not visit risque adult sites, I do make purchases on eBay, Amazon, British Airways, Expedia, etc., and do Internet banking. What information Facebook was harvesting is a moot point. I cannot risk any of my secure information getting into the hands of the web-based criminal fraternity; and due to its deliberate invasion of my privacy I regard Facebook as one of the less to be trusted organisations on the web. As far as I can see Facebook and the like are killing the Internet with their collective invasion of privacy. And I didn't opt into their scurrilous schemes - so wtf.

See this link for further information:

http://www.usatoday.com/tech/news/story/2011-11-15/facebook-privacy-tracking-data/51225112/1