Google is once again testing — or continuing to test — a jumbo-sized search result that displays a whopping 12 sitelinks below the main/top search result. Here’s one example of how it looks:
That’s an image posted yesterday by Seer Interactive, where their blog post has additional screenshots showing 12 sitelinks for queries such as “whitehouse” and “city of philadelphia.” Chris Barr also posted about this earlier today with a screenshot for the query “Taradel” (a printing company).
But the test actually dates back to at least April, when it was noticed on WebmasterWorld and discussed for about a week.
In all of the screenshots and examples that searchers have posted, the dozen sitelinks only show up on specific entity-related queries such as the exact company/organization/location name or its exact URL.
At the moment, I’m not able to trigger the experiment in either Firefox or Safari.
Postscript: See Official: Google Sitelinks Expands To 12 Pack.