I downloaded the app and when I try to log in I get a message that I can't log-in because there is no data plan found, however I do have the verizon data plan?
Delete the application. Reboot your device. Install the application and reboot your device again. Also, ensure that during the process of logging in you have 1XEV (not 1X or 1xev) and at least 2-3 bars.
I can't get it to delete? Normally I can delete an application by highlighting it and pressing the menu key but when I do that for the facebook app there is no option to delet, just move and hide.
You shouldn't be deleting apps like that anyway, it's the noob way. Click on your options icon then Advanced Options>Applications. Highlight Facebook, menu button, then delete.
Ok I deleted it, restarted, reinstalled, restarted. First try to connect I got the data service error. The next time I got an error "there was a problem while communicating with facebook." The next two times I started to get through and got "your login session has expired" before anything loaded and the time after that I got the data service message again. I have 1xev and all bars. I had the same problems last night when I tried connecting as well, so I don't think it's just a problem with the facebook site.