The "Online disinhibition effect"
Ever wondered why and how your normally demure and shy colleague morphs into the uber-monger of rumors and snitches when you happen to instant message her one night?
The New York Times tries to explain here.
KIA: Thanks for reminding me I am slacking off :). I'm trying, I'm trying.

Comments
If the situation above is one you personally experienced, then keep in mind that women are that way by their nature... devils that we are.
And just so you know, the little reminder message I sent to you is definitely something I would have said to your face! lol