How to enable notification area (systray) for Pidgin
Solution 1:
You have to whitelist the applications if you want to allow them to access the system tray.
Firstly install dconf-tools from the software center ( or by clicking here)
Then Press Alt+F2 and enter dconf-editor
and run it.
Now navigate to Desktop -> Unity -> Panel.
Now change the value of systray-whitelist to
['JavaEmbeddedFrame', 'Mumble', 'Wine', 'Skype', 'hp-systray', 'scp-dbus-service', 'Pidgin']
Solution 2:
Pidgin won't show up in the systray, just in the messaging menu:
Now for any other application to show up in the systray run the following code in the terminal:
gsettings set com.canonical.Unity.Panel systray-whitelist "['all']"