Larry is correct. It gives you the opportunity to have a live conversation with another member. It is on the upper left hand corner of the avatar.
I am logged in but I do not see a green corner. Idhair has a green corner All fall down and worship Idhair, it is the mark of the Gods.
Thank you Larry. I thought it meant a member changed their avatar. Didn't read anything in the rules section that explained it.
Now I see a green corner.......... The Gods have blessed me. I must hurry off and sacrifice a son.............