Like it or hate it or a lot of both, Facebook is the ten-ton gorilla of social-networking systems at the moment. It wasn't always this way and probably won't always be (something new will eventually come along and take over as the "Big Thing"), but at the moment it's where many many people keep up with their friends, acquaintances, and people they barely know. And it keeps changing its interface, has "privacy policies" that don't particularly protect privacy, is likely at any moment to come up with increasingly annoying ways to "monetize" its squillions of users, and offers no particularly useful way to retrieve your own data off of it.
That's why Archive Team has started a project called "Faceoff" which is attempting to create a set of programs, utilities, libraries, etc., to let users get their Facebook history exported from that service to ensure it is preserved no matter what happens to the service (or if the user chooses to close their account and go elsewhere).
Exporting your own Facebook material
You supposedly have the ability to download your own Facebook content (including things you posted under your own account, though not comments, etc., added to others' pages), which works similarly to the export feature of Twitter where you click on a button in the "account settings" screen and get told you'll be e-mailed when the export is ready to download. However, this sometimes (for inscrutable reasons) produces a response like:
You recently requested a download of your information on Facebook. Sorry, but your download generation failed. Visit your account settings if you wish to request a new download. https://www.facebook.com/editaccount.php Thanks, The Facebook Team
