Posting to Facebook iPhone 4

i have bunch of news applications on my iphone 4 and i post to Facebook from them often. recently i started to have problems with posting. when i tried to post, the app would not let me. this was happening on almost all the apps that i have. at first reinstalling the app would solve the problem but only temporarily. deleting the apps in my Facebook profile would help but again only temporarily and then the problem would come back again. the issue seem to be with authorization. ones i reauthorize the app by reinstalling it or removing it from the Facebook, the posting would work but only for a short time. i start experiencing this just recently and it seem to be happening on almost all the apps that i have. there few that are working fine to my surprise but most of them are not. i was wondering if anybody else experienced same problem. some apps examples:usa today,fox news,guardian.
MacBook Pro 13" Early 2011 Mac OS X (10.6.6) i5