Do you need to publish a user handle? If not, you do not need a username, just a meaningless identifier. If yes, do not assume that e-mail address is intended t

Do you need to publish a user handle? If not, you do not need a username, just a meaningless identifier. If yes, do not assume that e-mail address is intended to be public (Github e-mail is in commits anyway, SO e-mail is not). Do you provide a method for adding/changing/removing an e-mail address? (They're mutable and impermanent, e.g. work/school provided ones)