You won't be able to comment on it on LJ, but you will be able to comment on it on Dreamwidth, using your LJ URL as an OpenID.
(And OpenID is a URL that can confirm that you are who you say you are - so nobody else can claim to be andrewducker.livejournal.com for instance)
This entry was originally posted at http://andrewducker.dreamwidth.org/808.html. Please comment there using OpenID.