I know, and I'm also at 4 other forums. But I thought you might have meant that we're getting posts from the sister sites. Here's why:
I've been working with a poster here, and every time I get an email notice, it links me to toms in UK. Our thread is there too, and when I reply to her, I'm told to login, then that I'm not a member (I have permanent login here in my cookie.) I'm confused. It's not a similar thread where she posted the same Q, it's the same one. I have to close it, go back to this site, and find the same thread to reply in.