Well...I had wanted to vote for two, because I log in from work and from the house. I clicked 'home' first, then clicked 'work,' then voted...and as I waited for that split second, I seemed to have noticed that 'home' had become 'unclicked.'
I'd have to take a wild guess and say that some 60% is from the house, and the rest from school--over the year. During the vacation periods, it's like 99% from the house, and during semesters, it may be more like some 45% from the house.
As far as sites that I do log onto...JREF was my very first...and is almost the only one I do log onto at the moment.