Can't access Facebook account on Android phone

hello can anyone help me please?I cant access my fb account by my android phone.bt others site have no problem..only facebook has a problem..I tried to access by fb official fb,google chorme,my default browser and also fb lite.but I failed to access my fb account.since last 6 hour iam in trouble with this problem.only fb site is problem..but others sites are all right..others site are okey...pls give me any solution.