Chat with your Facebook friends right from your desktop, using any instant messaging software.

See:
http://www.facebook.com/sitetour/chat.php

You may reach the server here:

Hostname: jabber.co.za
Plaintext ports: 21, 80, 5222 (default jabber port)
SSL Encrypted ports: 53, 443, 5223 (default SSL port)
SSL certificate hashes:
MD5: C9:9A:08:C3:7A:8C:7D:2F:0A:91:7C:E4:C2:98:89:EB
SHA1: 29:50:F7:DF:F8:45:CE:D6:4F:4D:AD:BD:75:AA:46:CE:97:F9:3F:83