Everyone with PR1.3: enable extras-testing repository and download youself tweakflash app 0.4.0 (http://maemo.org/packages/package_in.../0.4.0-maemo1/)

I've tried it myself on PR1.3: after setting flash version to LNX 10,0,45,0 (recommended) the videos on facebook magically started to work! Thanks a lot to the developer of this app.