An excellent breakdown of the role identity plays in our online interactions. Social media encourages us to have lots of superficial relationships rather than a small number of deeper ones.
It's like a game show. OK, you've got one minute to connect with 20 people, starting NOW! It's unsatisfying by design.
I've made a few friends on Medium simply by exchanging words. It is satisfying even though I don't know what they look like, their age or much else and would probably just walk straight past them in the street. I believe with most of them, they're not even using their real name. Could I sum up their identity in three words? No.