This article makes me first off very glad to be teaching at a private institution (no annual online ethics tests required!).
I use my college-provided laptop & email address for virtually everything. Perhaps this is more justified as a media scholar, as commenting on a blog, watching YouTube clips, playing an MMO, or messing with Facebook all might become fodder for my teaching & research. But I think of the laptop/email account/software/server space/etc. along the lines of a company car (which I’m not saying we faculty do or should get!): your employer provides a tool that will be directly used in your work, but it’s also a perk of employment. You’re liable if you use it illegally, but you’re not beholden to compartmentalize your uses into work/non-work purposes.