Mashable just spotted the new implementation of Live Search integrated into Facebook. According to Mashable:
The implementation is fairly straightforward: in the search box on the top right of Facebook, which is also used for quick access to your friends’ profiles and intrasite search, there is now an option to “Search the Web,” which in turn triggers a query of Microsoft Live Search. Results then display within a custom interface designed for Facebook.
Satya Nadella announced the upcoming feature in July, although no timetable was given at that time. Branding on the new Facebook search page is understated, to say the least, with no indication until you begin a search that web search is available, and only a small text link to Live Search itself for “advanced” search. It also doesn’t appear from first glance that Facebook has included any of the search verticals like Image, Maps, or Video, which could be accessed from the Live Search page, opening a new window.
UPDATE: Here’s the Live Search blog post on “Live Search “friends” Facebook”, which includes a link to the Facebook blog, although Facebook doesn’t appear to have actually posted yet at the time of this writing.