I am an active user on Facebook. There was a number that was bugging me: 1,740 friends. Facebook used to have an upper limit of 1,000 friends, and now 5,000. But truely, how many of these friends do one actively maintained relationships with? Robin Dubar suggested 150. However, there are mechanisms to cope with expanding numbers. It seems that we have the ability to facially recognised about 1,500 people. 1,740 looks like a crazy number even with just facial recognition….