I think this is an issue with the new Facebook version. I noted they now have a disclaimer that if you don't have a "Data Browsing Service" you must download the 1.6 version instead. I never had issues with 1.6 but ever since upgrading to 1.7 I randomly alternate between "data service not found", "your login session has expired", and "error communicating with the facebook server" error messages even with full signal and using the browser, e-mail, or other data services. Every time I get the "login session expired" message it kicks me out to a login screen. I have also found that I may get this message 4 - 5 times in a row when simply trying to login (I never get past the login screen before it says my session has expired). The kicker is that when I follow the link to downgrade to version 1.6 after upgrade my OS to 5.0, it tells me the version is incompatible with my smartphone so I am stuck until they fix whatever is going on with this version.
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