FFA stands for "free-for-all".

In Internet marketing, FFA pages were very popular several years ago. They were pages that you, as a web site owner, could visit and add a link to your site free, in a category of your choice.

Often FFA pages would publish only a certain number of links at a time. Old links automatically disappeared.

Websites created FFA pages as a way of attracting visitors to their sites. In theory, they were supposed to be a useful service. However, they often quickly became full of tasteless junk.

Then someone thought up the idea of selling software that would distribute your links to hundreds or thousands of FFA pages all over the Internet.

Suddenly no one needed to visit FFA pages. They could just endlessly blast their links out to thousands of pages that almost no humans actually saw, and because of the competition, the links might stay on those worthless pages only a few seconds.

Some companies which charge you a fee for listing your site on thousands of "search engines" are actually listing your site on thousands of almost worthless FFA pages.

At one time you could probably boost your Google PageRank by submitting your site to FFA pages. These days, such pages are more likely to pass on zero PageRank.