The chat box at the left is for u all but
i think that someone dont know bout online list they just post their problem and go offline
when someone is not online then dont post any request or other
see this screenshot (Click to Zoom in)
Now u should have understood that if there is some name
then u can chat with that person
U can chat as a GUEST,WITH UR FB,TWITTER OR CHATAROL ACCOUNT TOO..