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Hi SpideywithXperia,
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Have you tried using the Official Facebook application instead? When you use the Share icon instead of choosing Facebook with Xperia, try just using the Facebook option.
Let me know how you get on.
Have you tried clearing the Xperia With Facebook application?
Menu > Settings > Apps > All > Xperia With Facebook > Clear Data.
Once this has been done, try using the service.
Are you able to load the handset in to safemode and then test from there.
Turn off the handset, power it back on, when you see the Sony/Xperia logo simply hold down the volume down key until the handset turns on completely.
The handset should now be in Safemode, now see if you can find Xperia With Facebook and perform the task.