Like it or not apps make things much more convenient. Use the web browser may be suitable solution for you but on a <4 inch screen it is not for many. I have not used facebook for well over three months apart from doing status updates with facebrick (when it was available). If N900 had a proper facebook app I would be using it everyday to post updates, quickly view photos, check updates, messages etc. I have tried it on the N900 and it was not a pleasant experience. I do not remember anyone complaining when facebook chat became integrated so not sure why people suggest these things are not needed.

At least from the nokia meego leaked video it looked like quite a bit of facebook functionality is going to be integrated into the contacts application so we would no longer need to hear this use the browser talk at least when it comes to facebook.