LOL, always login it means your cookies and sessions stored in Browser? Is this one of many cause for Account Hacked?
Only if someone gets his hands on your cookies. If that happens, your computer is compromised anyway and you have more things to worry about.
Probably not. Some people use bots or auto-refresh tools etc so it will skew their actual logged in time considerably.
This seems like a waste of bandwidth for someone who's last posted almost 2 years ago.
I've used it shortly, when lolgato (@Rollin chat) was spying when I was awake through Bitcointalk.