Lifehacker has published a post on how you can opt out of Facebook’s way of tracking you , even when you’re offline. They explain:
Facebook has started working with a data mining service to pair together your email address and other information stored on Facebook with advertising products to see what (and if) you’re clicking on ads… the way this data collection works is that it compares your online data with offline shopping habits. So, the easiest solution to keep it from happening? Don’t use the same phone number or email address on your Facebook account as you do when you sign up for loyalty or discount cards.
Read the whole post here, which also explains how to block Facebook cookies from distributing your data to third parties.