I don't get it, what kinds of use cases are they envisioning for "social search" and why would people use them? Search what movies my friends like? People who l

I don't get it, what kinds of use cases are they envisioning for "social search" and why would people use them? Search what movies my friends like? People who list movies on Facebook are the ones I don't want movie tips from. Search who lives in what city? If I don't know that already, then it's not likely I'd want to connect with them again. Maybe there are usages that make sense, but what are they?