From a Search Engine Land Post (With Screen Shot) by Matt McGee:
Reflecting the growing number of content types on its platform, Facebook has changed its search results display — the drop-down that appears as soon as users begin typing in the Facebook search box. The new display is organized into different content types, replacing the old version which showed results in a straight list format with no organization.
From an All Facebook Post by Jackie Cohen:
However, if you do click on “see more results from search,” the following page shows pages and applications in one long area, but if you scroll down, the heading “posts by everyone” shows up.