Someone sent me yet another reference to Facebook's weak defense of their policy that once on Facebook always on Facebook. I tell them to try get rid of their MySpace page and see how that works out.
Relational databases make it difficult to remove related entities once in the system and used by other entities. Given the numbers of friends one befriends, Facebook is possibly a tedious thing to administrate. That said, people seem shocked as they begin to finally realize the Web's existence has a dark side manifesting in everything from intellectual property to keeping one's DNA private. Databases leak and if one is using free services without reading the terms and conditions one is a fool. The world does not protect you. It will let you starve while it buys back a dime on a dollar of your retirement account from the men who stole your water.
If I am in a bad mood, I describe the web as a man-made viral pathogen rewriting our cultural DNA quickly, quietly and without our permission. No one knows how this will turn out for those who turn it on and can't turn off, but if you don't mind being the naked emperor, it should be ok at least until dildonics come with a URI and that is not far away.
In a good mood, I think of the web as the Great Gazoo combined with Fred's two feet. In the first case, a self-admitted "undependable, bit of a kook" alien can raise havoc if you call on him. In the second, a car made of stone, wood and animal skins can take you on a wild ride downhill. If you get in, you may not get out. How good are your own two feet?
Did anyone forsee all of this? Sure. We even warned you. First we were told it wasn't a problem, then it was society's fault, then that we were sick people for wanting to hide information from the commons.
What do I have to say now? "Take heed. Don't ask for more than you can handle You may get it." Toodaloo, Dum-dums!