Adium is displaying only Facebook contacts who message me first
Did you setup your account using the "Facebook chat" wizard?

If so, you can delete this account, it's not working anymore since Facebook enabled to Jabber access.

You should try to create a Jabber-type account and enter those informations:


Username: your_facebook_username@chat.facebook.com
Password: same as your Facebook profile
Server: chat.facebook.com
Port: 5222
Use SSL


You can find more details on the Facebook Chat about page.