How can I manage Empathy (Online) accounts in Lubuntu 12.10?
Online accounts can be accessed by command line (package gnome-online-accounts must be installed):
gnome-control-center online-accounts
The .desktop file for gnome-credentials-panel may not be enabled for LXDE. You will need to edit the file /usr/share/applications/gnome-credentials-panel.desktop and add LXDE to the OnlyShowIn section.
Then run gnome-control-center credentials from a terminal.
In Quantal the command line should be gnome-control-center credentials instead of gnome-control-center online-accounts. I don't know whether there's any difference in Lubuntu.