Yep that was added.
Karma (included by default) can be turned on and it'll let you like a poster for posting valuable info.
My only objection is that it requires a Facebook login to accomplish.
An internal system, linked to the accounts here would have had my preference.
I don't have a facebook account, and no intention of ever getting one, so I won't be able to partake in this "feature".
Remember, you the user, are the product being sold by facebook, nothing else.