Blake Lively is a 2. So is Gwyneth Paltrow. But Michael Fassbender? He's a 1.
The numbers are the degress of separation as calculated by a new Google tool called Bacon Number. It's based of "Six Degrees of Kevin Bacon," a sort of pop culture parlor game in which players find the fewest links between another actor and veteran leading man Kevin Bacon.
Lively is a 2 because she appeared with Tim Robbins in Green Lantern, and Robbins appeared with Bacon in Mystic River. Paltrow gets a 2 for appearing in Country Strong with Garrett Hedlund, who appeared with Bacon in Death Sentence. Fassbender makes the direct connect by being in X-Men: First Class with Bacon and, therefore, is a 1.
Type in any actor's name followed by "Bacon number" and you'll see for yourself who's closest—or farthest away—from the function's namesake.
So, who has the largest degree of separation? Post your findings in comments!