Google’s John Mueller said in a Google Hangout yesterday that there are no Google algorithms that specifically look at user actions on your web site and use that as a ranking factor. He said, “I don’t think we even see what people are doing on your web site.” So if they cannot see it, they can’t use it as a ranking factor.

The question came up at the 38:11 minute mark in the video:

John’s answer:

What about Panda and user experience factors? Well, there are other ways Google can tell if they think a user will be happy with your site. It is not based on user actions but based on your content and such.

Here is the video embed:

Forum discussion at Google.