How to un-hide notifications on Facebook?

[JaneDoe]

I accidentally clicked 'hide all' on notification that notifies me when someone comments on my wall, photos, or comments on my comments.
So how do I un-hide that? i still get notifications when someone likes my status, but not when someone comments on anything.

[seoul]

Go to this link: http://www.facebook.com/notifications.ph…

Check all boxes on upper-right corner related to which notifications you will receive. It should fix your problem, if not then inform me. I will find some other ways to help you.