Do you mean it is not going to come soon? They should provide graph API if they want to make it as a platform.

I would not be surprised if they were wary of going this route. A key ingredient to being "the anti-Facebook" would be to steer clear of spammy third-party applications, and the easiest way to do that is to simply not allow third-party applications.

I agree with @noahth that its a easier way to prevent from Spam post. However, it may reduce activities of users. There are pros and cons and its tricky to balance them.