FarmVille Posting to Facebook News Feed Problem
Currently, there is a problem in FarmVille that is causing an inability to post feeds/shares to the Facebook News Feed.
Zynga is aware of the problem and working on a fix. You can see the notice below above your FarmVille game area in the yellow dialog box where notices usually appear.
“Howdy Farmers, we are aware of the inability to post feeds to Facebook and are working toward a solution. We apologize for any inconvenience and we appreciate your patience.”