I have Google Adsense ads on this blog, so I need to share a bit of extra info:
2. Google’s use of the DART cookie enables it to serve ads to your users based on their visit to your sites and other sites on the Internet.
We use third-party advertising companies to serve ads when you visit our website. These companies may use information (not including your name, address, email address, or telephone number) about your visits to this and other websites in order to provide advertisements about goods and services of interest to you.