Authentication is required to comment, you can authenticate an OpenID.
Or, with Mozilla Persona.
Or, you can authenticate using one of the services below.
These services are only used to allow you to comment on this site. They are not used to post on your wall or tweet shit to your followers.Your identity is not revealed to other users and you have full control over the displayed name and optional to link to an external site.
A benefit of authenicating is you will be able to update and delete your comments.