Access to simple computer-based editing software and to a vast library of video news footage online makes it possible for self-identified "concerned citizens" to create their own ads and share them. The attack ad "Thanks John McCain," which uses quotes and footage from the candidate, was posted on YouTube on September 18, along with links to articles to back up the ad's claims. It should be noted that it is also possible for professionals and campaign workers to create and post ads anonymously.