Hi Paul,

I almost raised my own post about this, and just before I pressed the 'post' button, it started working.

If you retrieve your Facebook 'username' from the 'Account' -> 'Account Settings' menu at the top right hand side of facebook.com. Note that this isn't the same as the username you use to sign on to facebook.com.

It could be a number, or a name that you changed it to (mine is a name).

I put the username in the Facebook IM account on my N900 as 'myusername@chat.facebook.com', and used my normal Facebook password.

This didn't work quite a few times, but all of a sudden it did. Keep at it.

If you have a number username, it is probably usernumber@chat.facebook.com. However, I did notice that when I look at my Facebook contacts on the N900, they all appear to be prefixed with a hyphen, so it could be that if the Facebook username is a number, it could be '-yournumber@chat.facebook.com' (for example '-123456789@chat.facebook.com').

I didn't have to change any other settings, just the username and password, and I had to give it a few goes.

Let me know how you get on!

Cheers,
Mark.

Edited: Punctuation and missing words!