Hey does this site still show you as "on" even though you're just actually signed in but not on the site.

I think it stays on for a some time after you last clicked a link. I'm not sure about the exact duration, but it's long enough to show you online while writing a long post without switching pages, but short enough not to show you online all night if you put your phone away without explicitly logging out. Maybe half an hour to an hour since your last click, something like that.