Same for me, using Ubuntu Precise 12.04. Can open it with “gnome-control-center online-accounts” from a console (although there are two warning message, see below), but that's not clean to have to open a console to open it. I came to that issue while learning more about Ubuntu WebApps.
Additionally, opening the missing control panel from a console, I get these two messages: ** (gnome-control-center:10977): WARNING **: Could not find settings panel "online-accounts" ** (gnome-control-center:10977): WARNING **: Could not load setting panel "online-accounts": Unknown error -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to empathy in Ubuntu. https://bugs.launchpad.net/bugs/950352 Title: Online Accounts UI Missing To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/empathy/+bug/950352/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs