It's already within the formula and from what I'm seeing it's becoming a big deal.
The experiment went like this:
Site A had a very crawlable structure, no javascript or whatever and aimed the keyword X. It had a lot of indexed content, but the bounce rate and time spent was very poor.
Site B had next to no indexed content (all ajax), yet had very loyal visitors and a bounce rate of under 5% and also targetted the keyword X.
Result? B dominated A.
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