I’m sure you’ve seen them, those double underlined links from Kontera ContentLink, Vibrant Media, Snap. You rollover the link with your mouse, even accidentally, and you get small pop-up window showing you some advertising. I just found a site who has changed the link to a more regular looking single underline. And the word that was chosen as a link was the perfect word to be a helpful link to information at Apple.com. So I put my mouse on the link to click it, and a pop-up ad appeared helpfully suggesting I go to Apple.com. It was a Vibrant Media ad. I looked and there is no way to opt-out of seeing those ads. At least with Kontera ContentLink, I can opt-out, on a site by site basis.
You don’t think that the publisher doesn’t know those ads are annoying? Check out LinuxQuestions.org. They added ContentLink to their site, and are using it as a reason that you should register with their site. Quote: “Note that registered members see fewer ads, and ContentLink is completely disabled for all logged in members.”
Please reconsider using this type of advertising. It’s intrusive, distracting, and frustrating when things happen on-screen when you aren’t expecting it. And if you do that type of thing, you should never change the default formatting. We web users have had almost 15 years to learn that an underlined text is a link. Don’t change that expectation, it will hurt everyone in the long run.