I'm certain this has been brought up before (probably many times), but darned if I could find it in a search.
This might, of course, only show in certain themes (I use the default one), but in the Users Online listing at the bottom of the home page, I'm seeing different colors for some of the names. Mine's green, for instance, and I remember seeing pale blue and dark blue, possible some others too.
What's the "legend" for this color-coding, out of curiosity? If there's one or more existing threads on this, appropriate link(s) will be gratefully considered answer a-plenty.