Well it looks like facebook/bing has responded to Googles +1, read all about it:
Bing, Facebook Deepen Ties, Threaten Google +1
Microsoft has unveiled a deeper conglomerate of Bing and Facebook that harvests the power of the social Web, one year after forming a partnership to take "social search" to the next level.
When the partnership was formed it seemed meaningless and redundant. After all, if you're checking Facebook and Twitter several hundred times a day, do you need your friends' updates appearing in your Bing search results? Where's the value in that? Well here's a look at Bing's new Facebook features and why this may mean the end of Google +1.