briggidere - 3:05 am on Oct 29, 2010 (gmt 0)
Did you buy a lamp?
Everyone will have multiple profiles depending on how many pc's they use, times of day they are on, which Google account you were logged in to, if they have a smartphone etc.
I use a normal PC at work as well as a laptop that I take home with me. I'm pretty sure the laptop will have a work and personal profile attached to it as most of my searches at home don't relate to what I do during the day. Maybe they even go as far as knowing when I am on my lunch break and start reading news etc and switch the profiles for an hour.