Unfortunately, I just timed it now - 58 seconds before Tear was done loading and rendering facebook.com... I do however have to say the iphone version loads acceptably fast and everything works, including photo albums which were iffy at best in MicroB. Hooray for Webkit.
Again, however, your ordinary user isn't going to just realise they should search these forums for "Tear".... Nevertheless, I'm seeing a lot that still rules out "normal" users, and for the more advanced folk, I'm still concerned that Nokia isn't really sure what they want to do with the tablets themselves. If they are, they're not really doing a good job showing it as far as I can see. (And feel free to prove me wrong... I want that excuse to buy shiny N810 goodness.)