Google said it can be a “frustrating experience for our mobile searchers” to end up on a web page that is not mobile-friendly, thus they are adding the label to their mobile search results to communicate this to the searcher. In addition to the mobile-friendly label, Google is experimenting with a new ranking algorithm for mobile friendly web sites. How do you qualify to show such a label for your web pages? Google said it depends on if GoogleBot detects the following criteria: - Avoids software that is not common on mobile devices, like Flash - Uses text that is readable without zooming - Sizes content to the screen so users don’t have to scroll horizontally or zoom - Places links far enough apart so that the correct one can be easily tapped Get the full story at Search Engine Land