Google for Credit Card Numbers?
The problems with disclosing even small amounts of personal information are becoming more obvious. Electronic databases make the aggregation of small, otherwise innocuous pieces of personal information inevitable, and they can combine to form remarkably complete pictures of you that include your name, address and even detailed spending habits. Combine this with powerful search engines like Google and even your credit card number can quickly be looked-up, which is discomforting at the least.
More can be found here [Yahoo News]