Robin Dunbar, a professor of evolutionary anthropology at Oxford University, developed a theory in the 1990s dubbed Dunbar’s Number. The theory contends that the human brain is only capable of managing relationships–staying in contact at least once per year and knowing how friends relate to others–with about 150 people.
Until recently, it was believed that that only pertained to “offline” relationships.
Dunbar has now decided to shift focus to see whether Facebook has changed the number.
Full story: Sorry, Facebook friends: Our brains can’t keep up – CNET News.