Your friends on Facebook have more friends than you do
In this sample of Facebook users, the average person has 245 friends. However, the average friend of a person in this sample has 359 Facebook friends. The finding, that people’s friends have more friends than they do, was nearly universal (as it is for friendship networks off of Facebook). Only those in our sample who had among the 10% largest friends lists (over 780 friends) had friends who on average had smaller networks than their own.
Facebook friends are sparsely interconnected
It is commonly the case in people’s offline social networks that a friend of a friend is your friend, too. But on Facebook this is the exception, not the rule. A fully connected list of friends on Facebook would have a density of 1 (everyone knows everyone else). The average Facebook user in our sample had a friends list that is sparsely connected. As an example, if you were the average Facebook user from our sample with 245 friends, there are 29,890 possible friendship ties among those in your network. For the average user with 245 friends, 12% of the maximum 29,890 friendship linkages exist between friends.
Facebook users can reach an average of more than 150,000 Facebook users through their Facebook friends; the median user can reach about 31,000 others
At two degrees of separation (friends-of-friends), Facebook users in our sample can on average reach 156,569 other Facebook users. However, the relatively small number of users with very large friends lists, who also tended to have lists that are less interconnected, overstates the reach of the typical Facebook user. In our sample, the maximum reach was 7,821,772 other Facebook users. The median user (the middle user from our sample) can reach 31,170 people through their friends-of-friends.