I recently upgraded my Iphone 4s to IOS6 and the facebook push notifications aren't working.

Sometimes i do see notifications on the screen but it doesn't vibrate or give me any sound.

When i had IOS5 it was working well.

Anyone having same issues ?

Did you try notification center. See if you have missed something there. Makesure 3 icons are ON and alert should be ON to receive notification.

 Every application has its own settings for you to get notified.. check those settings under general settings to the facebook settings..i have an my ios to 6 too and the notification works just fine..
I dont see a reason why you arent getting push notiication when ios6 has a separate features thn the other ios .. 
 

notification settings, including push notification settings, are located inside the app. open yourbookmarks and tap account settings.