We create stuff online everyday and everywhere — Google apps, Flickr, Zooomr, Facebook, LinkedIn, Backpack, Twitter, Pownce, Delicious, Second Life, you name it — but do we really own our data?

None of these services propose an easy way to backup your data on your computer; some of them provide an API but that’s not what I call accessing your data — and if you can’t move it, it’s not yours.

Locking users in applications it’s not something new, it’s been the Microsoft strategy for years. We fought hard for having interchangeable file formats on the desktop and we never won. Now we’re facing the exact same problem with interchangeable data on the web — history is repeating in a bad way.

This time, the threat is more important than having a bunch of documents you can only read with Microsoft Word — you’re entire online life is being locked in.

Facebook’s terms of service clearly state that even if you’re responsible for the content you post on the site, you grant them all the rights to dispose of your data.

[…] 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 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.

Some argues that it will be the challenge of the Web 3.0 — whatever it means — but I don’t think it will happen anytime soon because it’s a vital strategy for online businesses.

UPDATE (04-01-08): Robert Scoble in trouble when his Facebook account was erased; he was trying to move its data.

UPDATE (01-01-08): Chris Bogan’s Have the Data Wars Begun.