I think Marco and Mossdog both make very good points about anonimity.

I have family members, and indeed know people in the fellrunning community, who can't have certain social media accounts due to their professional lives.

Of course everyone should be accountable, and i'd agree with needing to register personal details to have an account.

Also wouldn't have an objection to people being "politely encouraged" to have clear details of who they are, without it being compulsory.