If you mouse over your own head, it says "This is you". Cheeky.
Check this out: mouse over my robot icon there. See that drop down stuff? If you don't want to use email, and you find leaving "message comments" just somehow wrong, you can message people directly. Provided people know about their inbox, and go and change the settings on it so they know when to check it. Speaking of which, you should do that. Livejournal can do anything these days, provided people notice. None of the new stuff they've added over the last three years has been entirely intergrated.