Dunbar's number

"As constant use of social media has become the new normal, however, people have started challenging the continued relevance of Dunbar’s number: Isn’t it easier to have more friends when we have Facebook, Twitter, and Instagram to help us to cultivate and maintain them? Some, like the University of California, Berkeley, professor Morten Hansen, have pointed out that social media has facilitated more effective collaborations. Our real-world friends tend to know the same people that we do, but, in the online world, we can expand our networks strategically, leading to better business outcomes. Yet, when researchers tried to determine whether virtual networks increase our strong ties as well as our weak ones (the ones that Hansen had focussed on), they found that, for now, the essential Dunbar number, a hundred and fifty, has remained constant."
THE LIMITS OF FRIENDSHIP