And a good thing to remember to do!. I bought my n810 second hand on e-bay. and was surprised to find when I booted it that it still had the old owners setup I could access their google mail, facebook, IM as well as some other sites that they had saved login credentials for. the works!
Lucky for them that I'm a nice guy and deleted all that stuff, I also sent them a note suggesting they be more careful in the future.