As things stand, to leave a comment about a post on the Wolfram Blog, one has only three choices: (1) login first with Facebook; (2) login first with Twitter; or (3) login as guest (and have the comment held for moderation).
Given the known excesses of Facebook and Twitter and the known (and unknown) security risks of using Facebook and Twitter logins on 3rd-party sites, why not include another option, namely:
(4) login first with one's Wolfram account?
Is there some technical or other impediment to having that option added?