Go to "Accounts" and select "Manage Accounts."
- On the Basic tab, enter the following info:
- Protocol: XMPP
- Username: < your Facebook username >
- Domain: chat.facebook.com
- Resource: Pidgin
- Password: < your Facebook password >
- Local alias: < display name >
- Click the Advanced tab, then enter the following info:
- Connect port: 5222
- Connect server: chat.facebook.com
- (Uncheck the box labeled "Require SSL/TLS") or select "Require SSL/TLS if available"
Check the like https://www.facebook.com/sitetour/chat.php for settings.