The good news: DSi firmware 1.4 is now available in Europe, bringing the Facebook photo uploading capability along with it, according to an announcement by Nintendo. If you want to snap pics from your DSi and upload them to Facebook (after altering them with the DSi's image manipulation stuff, if you like), awesome!
The bad news: DSi firmware 1.4 blocks flash carts. If you've been using an Acekard2i or a DSTTi to run homebrew on your DSi, you should probably not download it. If, on the other hand, you've been using a DSi flash cart to play retail games, we encourage you to update immediately. Gotta have Facebook, right?