Posting free advertisements on the internet is easier than it ever has been. There are several decent free advertising networks (or advertising “exchanges”) that offer unlimited free advertising in exchange for hosting an advertisement window on your own site.
Some of the best advertising networks/ad exchanges are:
Adone is a Dutch advertising firm that offers a free advertising exchange.
Adgridwork is a text-based free advertising exchange.
Buzzlord is a free advertising exchange/network that focuses on banner and image advertisements.
Adsflip is another free advertising exchange.
All of these free advertising exchanges work just fine, and they are completely free. Some of them offer generous startup credits to get your ads circulating long before you participate in the ad network by hosting advertising on your site. It doesn’t hurt to sign up for an account and post your ads to all of these free advertising media.