Google will punish sites that use annoying pop-up ads [↗]
Google is about to deal a small blow to some of the most annoying ads on mobile: pop-ups and interstitials. It’s not a stretch to argue that readers don’t like these ads. So Google is making a call that websites that use pop-ups and interstitials are worse search results and may rank them lower because of it.
In general, I’m not a fan of letting Google dictate how developers/designers should create their web pages, but in this case, I’m all for it.