Before we get in a tizzy, “social search” here only refers to looking at what your friends are doing on a social network. But yes, Facebook is currently testing real-time search results for searches on the social network:

I just read an interesting report published by Nielsen that examines time spent on multiple Social and Micro Networks. The study compares total minutes in April 2009 compared to April 2008. The results are not as much surprising as they are revealing.
According to Nielsen, total minutes spent on social networking sites has increased 83 percent [...]