Have you read Facebook’s terms of service? Here is one particularly worrying bit (and I’m sure there is a similar part of the MySpace ToS):

When you post User Content to the Site, you authorize and direct us to make such copies thereof as we deem necessary in order to facilitate the posting and storage of the User Content on the Site. By posting User Content to any part of the Site, you automatically grant, and you represent and warrant that you have the right to grant, to the Company an irrevocable, perpetual, non-exclusive, transferable, fully paid, worldwide license (with the right to sublicense) to use, copy, publicly perform, publicly display, reformat, translate, excerpt (in whole or in part) and distribute such User Content for any purpose, commercial, advertising, or otherwise, on or in connection with the Site or the promotion thereof, to prepare derivative works of, or incorporate into other works, such User Content, and to grant and authorize sublicenses of the foregoing. You may remove your User Content from the Site at any time. If you choose to remove your User Content, the license granted above will automatically expire, however you acknowledge that the Company may retain archived copies of your User Content. Facebook does not assert any ownership over your User Content; rather, as between us and you, subject to the rights granted to us in these Terms, you retain full ownership of all of your User Content and any intellectual property rights or other proprietary rights associated with your User Content.

I bet you never saw that.

Before you upload anything you’ve created to a social networking/video/blogging site, make sure you read the ToS. You want to know what you’re agreeing to before you upload your work.

Have you uploaded music you wrote to MySpace? Guess what, they can use it for whatever you want. Because you agreed to it.

If you’re not okay with the possibility of Facebook or MySpace using your pcitures, movies, musi, etc, don’t upload it. While they may not actually make use of it, they can if they want.