Any other information that it requests for its own market research should be optional. Be especially cautious of Web sites that force you to divulge personal information that isn't required in the normal course of business. Never give out bank account information or Internet account passwords. Check for a privacy policy on the Web site. It's no guarantee that your privacy is assured, but it gives you some added confidence.
Many Web sites add customers to their mailing list automatically.
If you don't want to receive mail from them, tell them. Choose unique passwords Some Web sites require you to choose a password to access the site. Although it's tempting to choose something like your name, birthday or telephone number, this is just asking for trouble. Create a password that is difficult to guess, especially if the password gives you access to a service that costs you money.