Here's a far out suggestion, that is probably impossible. I'll throw it out there anyway.
What if there was a way, that we could see if someone was online, like the small plus beside the report button on a post. Except it was put INTO a post like so:
MetroX: +
Kordiss: +
Playaj: -
Fezch: +
So we can see who is and isn't online, quickly.
I know this would be hard to do, but it would be pretty cool.