Looks like Facebook feeling too much heat of Google+, Its leaving no stone unturned to make sure the users don’t leave them. It did a Google+ by introducing feature that allowed sharing the updates selectively to friends/public or custom group.
Now it has introduced a new feature called Facebook Subscriptions, that allows users to subscribe to your Updates that are public. It is very much in lines with what Twitter & Google+ have been offering since their inception. Its one of the best features that Facebook has introduced off late.