I choose a different screen name for each site. I figure if I run into someone I've played against before, I might as well make them work a bit to figure out my style. I don't know if it's had a positive affect, but seems to make sense to me. I've been at Party for a while now, and I've improved a great deal over the last several monthes, so I hope I do run into players who played against me when I was clueless. If they have stats on me from a session in May, they would be totally irrelevant now, and possibly work in my favor. I've played exclusively at party until very recently, and now that I play reasonably well I think anonimity (is that spelled right?) is better.