IMPORTANT - Make sure to test this on http://beta.resistancecalendar.org/ before going to prod, just to make sure that this code is working properly with the existing FB sharing app.
Updated FB.ui() params to supply missing open graph metadata.
(unrelated to original issue but important) - slightly repositioned share popover so that it would no longer go offscreen at mobile width
IMPORTANT - Make sure to test this on http://beta.resistancecalendar.org/ before going to prod, just to make sure that this code is working properly with the existing FB sharing app.