Google is now folding its social search within the rest of its natural search results pages, rather than segregating them at the bottom of the results as it had been doing.
What this means is you’ll begin to see content from people to whom you’re connected on social media sites like Twitter with a notation that that person shared that particular link on Twitter, for example. Content that has been Liked from people in your Facebook network will NOT be included.
Significantly, your social connections may boost the ranking in which a link appears in your results; the stronger the connection, the higher the link may appear. Search Engine Land has all deets. This video from Google illustrates the changes. Found at YouTube from Google.