The study said that among the 1.59 billion people active on Facebook, the degree of separation is 3.57.
Users can look at the study in detail at Facebook's research site and see their own degrees of separation.
The study also looked at the degrees of separation for founder Mark Zuckerberg and Chief Operating Officer Sheryl Sandberg.
Zuckerberg's average degrees of separation is 3.17 and Sandberg's is a low 2.92.
"In summary, we find that the world is more closely connected than you might think," the study said.