The Facebook app for the 2 Eseries models are finally available for download!
As I have tried to download it from the Ovi Store, I failed miserably as it does not support N86 and other S60v3 devices.
So if you have an E71 or E72 then you are in luck.
These are some screenshots I grabbed from here
According to Ovi Store, Facebook ® for Nokia E71/E72 lets you keep up with your friends right at your fingertips. Update your status, see what your friends are up to, upload photos, check messages and lookup phone numbers when you need them anytime and anywhere. Facebook allows you to comment on your friend’s statuses, RSVP to e vent invites and confirm or deny friend requests.
Point your phone browser to http://store.ovi.com now or check out the direct link here