Forums and Message Boards - There's many sites on the Internet that allow you to register and post on their website for free.

For instance, if you own a company that provides services to tourists while in a certain resort - find the message boards and forums that people are reading to learn about that area. Get a user name and post about who you are and what you do. Be sure to use a 'signature' that is normally available when you register as a user. Include your website address if you have one, your address and telephone number and a 'tag line' that says what you are about.