Fine... if people can change both their username and email. But the risk is that something said once can and will be used against a person in the future. The

Fine... if people can change both their username and email. But the risk is that something said once can and will be used against a person in the future. The worst examples of that are currently being demonstrated by US border control Googling people and asking for social media login information. If permanence needs to exist to retain context of discussions, then let only the content be permanent and not the identity of the person who said something.