Bing also supports social search with (according to this article) Twitter and Google+
“Since I’m only interested in the Facebook integration, here are the relevant points from today’s announcement:
- Ask Friends: You can post a question to get help from your Facebook friends as you search, tag friends Bing suggests might know about the topic, and share your search so that your friends can reply to your question on either Facebook or Bing.
- Friends Who Might Know: Once you authorize Bing, the sidebar helps you post a question to get help from your Facebook friends as you search. Bing suggests Facebook friends who might know about the topic – based on what they Like, their Facebook profile information, or photos they have shared.
- Activity feed: From the activity feed in the sidebar, you can see posts and queries you and your friends have chosen to share from Bing. You can help answer friends’ questions, Like something interesting they have shared. Because these activities show up in both Bing (activity feed) and Facebook, you can comment on them from either place.”