For Facebook 1.   Open Pidgin and select add account. 2.   In basic tab set       Protocol:  XMPP       Username :facebook username (not email address)        Resource : Pidgin         Domain: chat.facebook.com       password : facebook pa ssword        Local Ali as: sa me a s name in face book 3.   In Advanced        Connection security : Use encryption if available       untick allow  pl ain text auth over unencrypt ed streams       Connect port : 443       C onnect S erver: chat.facebook.com       File Transfer Proxy and Bosh url must be emp ty 4.  If you are behind a proxy serv er the go to proxy tab and select HTTP and enter proxy server details 5.  Then save settings. This will con...