...that Twitter conversation is getting messy...
Twitter not always a great platform for subtlety. We're talking about one additional question and one response, not really a reexamination of the original statements. Here's where that conversation has gone. My emphasis added at the word "analytics", adjacent to "bounce rate"...
Daniele Nespoli ‏@dnespo May 13
@methode Thank you Gary, does UX include serp bounce rate for desktop users?
Gary Illyes ‏@methode May 13
@dnespo we don't use analytics/bounce rate in search ranking
It seems to me that this is a discussion we've had in this forum many times before, and I agree with Mikkel (on FB) that Google would not want to risk its credibility by using Analytics data after saying it doesn't. There are many reasons in any event why Analytics data would not be a useful basis for an algorithm.
Google has also used return-to-serps as a signal, which is not using Analytics data. Early on, in Panda, return to serps was considered to be a signal that was confirmable by multiple sources and could demote a page. I assume that Google is using an analogous signal in evaluating Mobile.
FWIW, the above is not the original meaning I'd attached to the question of "UX as a ranking factor".
The meaning of "UX" has evolved over the past several years to encompass the entire experience of using a site... and certainly measuring it is much more subtle and multi-faceted than return to serps. Page layout and design, ease of navigation, frequency of sharing and bookmarking, etc, all enter into the success of a site and the desirability for Google of sending searchers to that site. Google I'm sure generates heuristics based on aspects of user experience, and these get incorporated into algo evaluations in many ways.
I feel that these "UX" factors are all major considerations in the success of a site, with or without Google.
Regarding the distinction being made between mobile and desktop, though, the question may be what Gary means by "ranking factor", and perhaps also (and I can only guess here) what's the difference between a positive ranking factor and a negative filter?
A page has got to pass some usability tests to get into the mobile index. So, usability is in a sense a "ranking factor" in mobile.
But, on the desktop side, Google initially allows pretty much anything that it can crawl. Gary
may be saying that the ranking is determined by content, relevance, link factors, and personalization... and that usability doesn't boost you any higher. But, lack of usability might drop you lower. There's a gray area in there as well of query rewriting and perception of intent, not all exactly "personalization" in the traditional sense, but still a layer of user behavior.
I'm not pushing this theory... just trying to get at what he was saying, to see if there's anything we can learn from it.