This is the Skype API Plugin for Pidgin/libpurple/Adium. If you're already running Skype, you can have your Skype contacts displayed with your Pidgin/libpurple/Adium contacts. It is intended as a complete replacement for the Skype user interface, hopefully everything you can do in Skype you can do with this plugin.
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If you want to enable Facebook Chat for Pidgin in Ubuntu you need to install Facebook Chat for Pidgin plugin.This is a Facebook chat plugin for Pidgin and libpurple messengers. It connects to the new Facebook Chat IM service without the need for an API key.
How to install Pidgin 2.4.3 in Linux Ubuntu 7.04 Feisty Fawn by compiling its source code(to compile Pidgin source code)