CNN - Elon Musk's Twitter feed states that he will "authenticate all real humans." Musk could seek to require real names on accounts or require photo id, or integration with 3rd-party services where users are already known. His pet peeve is spam accounts.
Facebook made changes to its names policy in 2015 after critics pointed out that abuse victims and other vulnerable groups had good reasons to use pseudonyms. Users can provide reasons to the company why they avoid using their real names.
Mark Brooks: Behavior changes considerably when people are anonymous. Online social communities really need to know and assure that real humans are behind each profile, and are 'good actors.' No small task, but at least the ability to check liveness and verify someone is the same person as in their photo is easy with FaceTec. We also have the purpose-built RealMe which provides the ability to verify someone is real, and the state of their reputation and priors. (Full Disclosure: FaceTec and RealMe are clients of Courtland Brooks)