Before we get in a tizzy, “social search” here only refers to looking at what your friends are doing on a social network. But yes, Facebook is currently testing real-time search results for searches on the social network:
Those of you in the test group will be able to find content from the people, organizations and public figures that matter to you as soon as they share it on Facebook. . . .
Those of you in the test group will see new layouts for search results that will continue to include people’s profiles, Facebook Pages, groups and applications, and some entirely new Search features. With the test, you will be able to search your News Feed for the most recent status updates, photos, links, videos and notes being shared by your friends and the Facebook Pages of which you’re a fan.