As you may remember, Google is laying hints that mobile UX is coming as a ranking factor. That being the case, Googlers are now talking a lot about mobile UX (user experience) issues they see often, which I suspect might be baked into the algorithm they may or may not be working on.
Gary Illyes from Google posted on Google+ this morning that mobile-friendly web sites should never use menu hovers. He said:
If you create a mobile friendly site, please check that you don't have menus that require hovering. I don't know how to do that on a mobile.
A few Googlers reshared the post but Pierre Far from Google added a bit more, saying "a way to avoid this is to use both :hover and :active CSS pseudo selectors."
So when designing your new mobile friendly web site, please consider these Google comments.
I wouldn't be surprised if we hear news on a new ranking signal around mobile in early 2015.
Forum discussion at Google+.
