I think you misunderstood what I said, so I will restate
1. Chat is nice because it's real-time and doesn't required filling up mailbox. It has nothing to do with the philosophy of sharing (or not sharing) of info/content.
2. Chat is convenient because it provide another (better) way to tell someone to clean their full mailbox.
3. If the purpose is wanting to know know who is online, chat is another way of providing that.
4. Furthermore, as a software developer I know that chat is not resource intensive (no keeping track of data) and easier to implement (independent component)
The chat I'm talking about is peer to peer, there is no "chatroom."
If the purpose is to see if someone is online so you can communicates with them and not trying to find out what they are doing (aka spying), all you have to do is go to main page, click on person that is online and select chat.
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