Facebook is enabled now. Yahoo (at least for Calendar integration) is https://launchpad.net/bugs/1554823 GNOME doesn't have a Twitter app in the default install but you could file a bug for Twitter integration, assuming there's some app that would use it.
** Changed in: gnome-online-accounts (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gnome-online-accounts in Ubuntu. https://bugs.launchpad.net/bugs/993531 Title: Compile with Facebook, Twitter and Yahoo providers Status in gnome-online-accounts package in Ubuntu: Fix Released Bug description: The version of Gnome Online Accounts bundled with Precise Pangolin comes with only the Google and Windows Live providers compiled. It would be nice to see the other 3 providers compiled in as well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-online-accounts/+bug/993531/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp