Finding a job, we're often told, is more about who you know rather than what you know. Glassdoor, the site that gives you an insider look into companies' interview questions and salaries, now wants to add personal insider connections to give you an edge in your job search—via your Facebook friends.
When you connect Glassdoor to Facebook and click on a company, now in
addition to seeing job listings, reviews, salaries, and interview
details, you'll see which Facebook friends (or friends of friends) are
connected to that company—which means you might have an ally in your job
application if you're interested in applying.
While professional networking site LinkedIn might seem a more obvious
network to turn to for job searching, there's no reason you can't use
both services. Some or many of your friends might not be using LinkedIn
or might be more active on Facebook, and when you're looking for a job,
it makes sense to try every avenue.
Here is a Youtube video with a nice overview.