Skype works fine here. FB I never tried.

I am more then happy to be able to rely on the N900's obsolescence not to find myself forced or tricked into the use of a new version of Skype, overhauled by MS Marketing dpt including "NEW: conversation ads" that intended to spark “meaningful conversations” about brands among users.

http://blogs.skype.com/en/advertising/

MS bring on those brilliant idea's and the N900 will outlast Skype