When a_skeleton_03 made his post about people chasing Araysar off the forums, I scrolled up and sure enough, the little logged in button was next to Araysar's name. That was at 6 pm
So yeah, like 4 hours later he was at least lurking.
I think that happens to everyone if you have a PC at home that has you logged in a tab somewhere.
I was out of town till this morning and I would check on my phone and it was showing me with that green dot though I wasn't logged in on the phone and I hadn't been on the PC all day.