"Facebook's terms of service (TOS) used to say that when you closed an account on their network, any rights they claimed to the original content you uploaded would expire. Not anymore.Cripes! Not seen Facebook's new terms and conditions? Take a look at the above article from The Consumerist.
Now, anything you upload to Facebook can be used by Facebook in any way they deem fit, forever, no matter what you do later. Want to close your account? Good for you, but Facebook still has the right to do whatever it wants with your old content. They can even sublicense it if they want."
It appears there is life after web 2.0 death... at least when Facebook own your content and own it... forever. *cue sound of mad cackling laughter*
Ethical educational issue for consideration number 35234: If you encourage your students to use web 2.0 services, make sure they are comfortable with the implications of signing up for that 'free' service!