In his defense, I have an awful lot of difficulty remembering people's LJ and/or Dreamwidth handles once I've befriended them on Facebook! It helps if I've had more contact with them when we were just communicating via blog messages, or if they use a real photo of themselves in both places, or if they sometimes use their real name on their blog.

I, of course, made it rather easy for everyone by taking the advice of a fellow writer and using my own name in order to build an online presence for myself. Not that that matters as much to me today as it did 19 years ago or so!