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ihave Xperia P LT22i,I can not log in Xperia with Facebook, i just update Jelly Been 4.1.2 ????????
i will be greatful to u if u find the Solution ..............................
Setting/Accounts/Add Accounts/XperiaTM with Facebook .. R u going here to login in ur account ?? y u mentioned this?? try this too, jus go to settings>apps>all>facebook>uninstall updates, clear data , reboot .. let ur device gets settled then try to open the Facebook , jus try
Again same prob....................................
.. Will get back to u again with a solution .. btw tat jus try a factory reset now .. remember it deletes ur contacts and all ur downloaded apps .. it is the other only way i guess 