I've often wondered what it means to 'be on-line'.
I tend to keep a dozen or so browser windows open at a time, and many tabs in each window. Does just having a tab open, or being logged in, even if I'm not actually on that tab count? What if the computer is sleeping (I sometimes go weeks w/o a reboot/shutdown - I'm at 10 days at the moment)?
OK, I just experimented - viewed the site from another computer w/o loging in there. It showed me as on-line. It still showed on-line when I moved to another window, when I moved to another program, even when my computer was sleeping.
So I guess being 'on-line' is pretty loose - if you logged in and didn't log out, I guess you are 'on-line', even when you are sleeping, showering, etc.
But it's still a record, but maybe affected by people with tablets, phones, etc, creating more opportunities to be logged in and 'on-line'?
-ERD50