Marketers selling your private information

Scary thought, companies – such as Gillete – are able to purchase sensitive information about you – legally!? This seen on the Consumerist:
October 6, 2006
Dear Mr. Popken,
Thank you for contacting The Gillette Company.
We are always concerned when a complaint is received and appreciate your bringing the matter to our attention. We apologize for any inconvenience this may have caused. We have an outside source that provides us with this information.
Again, thank you for taking the time to contact us. Please let us know if you have any additional questions or comments.
Mai X.
Consumer Service Associate
010823372A
Without subscribing to any mailing lists, or submitting sensitive information like address and birth-dates, companies like Gillette are able to target consumers mailing birthday celebration(s) offering free products (with the intent to persuade you to continue using said product).
To be honest, I had never really thought about something like this being a violation of my personal privacy, but now that I think of it, it’s a bit discomforting and scary. Companies are getting your personal info from somewhere, but where?
