I know you have to get an approval to add to your list and then you can chat. But I know there are so much more to it. Today, for the first time I was chatting with a friend, and then suddenly some stranger came in and sent message wishing to be added. How did she do this?? Also, Currently I have two people on my list. If I was chatting with one person from the list, can the other person can hear / see me if they logged on? What if the second person wanted to chat with me as well, how does that work?