Note that many websites have their own advertising, unrelated to adware.
Adware is any software application in which advertising is displayed while the program is running. The authors of these applications include additional code that delivers the ads, which can be viewed through pop-up windows or through a bar that appears on a computer screen and sometimes through text links or in integrated search results. Adware may or may not track personal information. It may also gather information anonymously or in aggregate only. Users should check the EULA and Privacy policy to ensure if the adware on their machines conforms to their standards.
Official
Description:
From their wesite:
Personalize your favorite file-sharing program with FileFreedom 4.0. Get file ratings, reviews, recommendations, most popular lists, intant messengers, playlist sharing, and a host of other unique features. FileFreedom works seamlessly with your favorite file-sharing networks, such as Morpheus, Grokster, BearShare, KaZaA, LimeWire.
Comment:
Displays popups and popunders. Their site has been listed for sale. It is unknown if legacy versions are still in circulation.