User blog comment:Brandon Rhea/Making Ads Better: The Basics/@comment-25435121-20170116192159

Flash and video ads are the worst offenders to me. Also pop-over ads that pop over the content you are trying to read. Even if they have a little close button, these are often hard to dismiss when on mobile. Those horrid inline ads too that scan the content of the page and make random links on words... I can go on and on for ads I really hate.

The best ads for me are static text and images that go in a designated area of the site and never intrude on the actual content. Wikia seems to get this right most of the time, but improvement is always welcome!