Renowned anthropologist Robin Dunbar surveyed the social media habits of roughly 3,400 Facebook users.
He found that on average users could only count on 4.1 of their virtual friends for support during an "emotional crisis."
Participants also said they would only share sympathy on social media with 13.6 of their friends.
Dunbar found users have on average between 155 and 175 friends on Facebook.
Relationship experts say Facebook is good for sharing but not for emotional support.
"Social support makes us feel like we belong and that's a good thing about Facebook, that we have all those friends,” Cape Girardeau psychiatrist Dr. David Van Pelt said. “However, emotional support is much more important for our psychological well-being."