Ya I have that too. It's funny because for me in a dream I feel like I've known them for ages, it's like I instantly recognize there face even though I've never seen it before and then they change their profile pic and I don't know who they are for a while
I've had other people's avatars appear in my dreams before... I think it's the "community" aspect -- I really associate the avatars with people. I get a little disoriented when people change their avatars; I kind of lose track of who people are!
Hey man didn't realise you posted on my profile I seem to be in a lot of peoples dreams in some way...hmmm
LOL the lizard/dinosaur in your signature has appeared in my dreams twice now. I've been scratching my head, wondering where "Lizard Man" came from... I finally recognized him from your signature! I've fought fantastic battles with Lizard Man!