Earlier this month Google rolled out a new search feature that displays an additional search box in the results set.

According to the Google Blog here’s why and how the additional box is generated:
This feature will now occur when we detect a high probability that a user wants more refined search results within a specific site. Like the rest of our snippets, the sites that display the site search box are chosen algorithmically based on metrics that measure how useful the search box is to users.
You would think that Google would limit this service to directories and informational website. Think again. Here are a number of business websites that return search-within-a-search results.
It’s important to note that searches performed in the additional search box are returned at Google, not at the website associated with it.
This is a smart and useful feature. When and how will Google offer it as a premium service for advertisers?
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