Specifically if you wanted to search facebook for a person’s name you could search a website like this.
That returns quite a few results. You can apply this search methodology to just about anything you might want to ask.
Searching for medical information?
site:webmd.com + Your search phrase
This will limit your search results to only those from the webmd.com domain. Pretty simple and really useful, try it out and see what you can come up with.