It seems that someone was able to pull the facebook app from windows mobile 6.5 I've installed it and it seems to work pretty good. It's a little slow switching from the different screens and scrolling but it's better than the mobile version.
credit goes to jug6ernaut at xda
as he/she posted the information.
http://forum.xda-developers.com/showthread.php?t=489379
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Did a search in the touchpro section and didn't find anything. Just went to the software section and it's listed there. If it needs to be closed, please close it.