This is something I'm looking into and will hopefully do soon. This will be in the chat room at least, and maybe the main site.
You can post answers if you have related suggestions or better ideas of ways to do this.
We there be a whole page dedicated to this, or just a small box? Maybe we can also have it so that we can invite members who are onsite into chat.
You could make it so that if you clicked on to someones profile, it would say if they were on or not.
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