I'm using the ShareLinkTask in an app I'm developing, however, on the emulator it doesn't appear to do anything, not even pretend to go through the motions. Is this the sign of a bug with my code, or is this just how the emulator behaves?
That's the way the emulator works with this task.
From msdn
Allows an application to launch a dialog that enables the user to share a link on the social networks of their choice.
The emulator does not have any social networks so nothing to share.