While idly perusing yesterday's poll answers, I noticed this:
See that there? That (next to "Martyn") is a twitter icon.
Now, I know some people do Mysterious Magic to make their teeny-tiny LJ icon look like something other than the default but... twitter?
Anyway, it turns out you can log in to LJ with your twitter credentials. And vote in polls! Also with your Facebook credentials, should you have such things. And with the credentials of some other things I've never heard of (mail.ru, vkontakte) for which I'm blaming Russia.
I knew about OpenID, but this is all new to me. When did that arrive?