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Nicole Hess caught Google testing using a line separator in the search results between organic results. She posted a screen shot on Twitter and it does look legit.
Google typically uses these line separators to distinguish between organic and ads, local and organic results and any other non organic result added to the search results listings.
But you typically won't see the line separator between organic results.
I personally tried to replicate this but was unable to. So maybe this is a test or a weird quirk Nicole spotted at the right time?
Forum discussion at Twitter.
