"In today’s world of real-time status updates, search is evolving to account for the social nature of the web. Facebook
is pushing forward in this direction with on-site search functionality
that now displays search results — for Facebook and web content — based
on “Likes” and shares.
Facebook appears to have quietly rolled out
the beefed-up search offering some time over the past few days; it was
first spotted by All Facebook.
From the looks of it, Facebook is ranking results based on how users engage with content via its social plugins.
It’s unclear how Facebook is defining its formula — the formula seems
to account for shares and Likes from a member’s friends as well as
shares and Likes from everyone else to determine an item’s placement."
Read more at www.mashable.com