How to post to a users wall using Facebook SDK

I want to post some text to a users wall using the facebook sdk in an iOS app.

Is posting an open graph story now the only way to do that?

I've found with open graph stories they are really strange, you can only post things in the format "user x a y" where you preset x and y directly on facebook, like user ata a pizza or user played a game. Setting up each one is pretty laborious too because you have to create a .php object on an external server for each one.

Am I missing something or is there a simpler way to go about this?