Facebook (FB) announced on Wednesday that they’ve made FB chat available everywhere using the Jabber technology, an open messaging protocol supported by most instant messaging (IM) software. Guess what? The Nokia N900 supported Jabber out of the box since it was launched! I’ll show you how you can add FB chat on the N900 without the need to install additional app or plugin.

Step 1. On your Nokia N900, go to Settings – VoIP and IM accounts and click the New button. Select Jabber as the service.

Step 2. Find your Facebook Chat username on this link by clicking on one of the clients. You just need to know the Jabber ID and your Facebook password.

Step 3. Type your username and password from step 2, then sign in. You don’t need to change anything else.

That’s it! You can now chat with your Facebook friends directly from your Contacts book without having to download apps or plugins. You can change your availability status directly from the status area on the Nokia N900.