legal question about facebook authorization

I am having problems with the facebook authorization p开发者_开发问答rocess within my app. I want to post something on the users facebook page with a dialog which is shown to the user first, and request the "publish_stream" permission. If I do so the user is redirected every 2 hours to the request page where it says that the user has already allowed this app to do this, which is very annoying for the user....

So my question is what happens if I don't ask about permission to post on the wall, but still show the user the dialog which shows what is posted on his page? is this legal ? can I get any problems what so ever by doing this? Cause posting on the users wall without asking permission, works just fine.

thanks for the help

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The Facebook documentation states that if you prompt for publish_stream, you will be able to post on the users wall indefinitely, and thus you wouldn't also need offline_access.

publish_stream Enables your app to post content, comments, and likes to a user's stream and to the streams of the user's friends. With this permission, you can publish content to a user's feed at any time, without requiring offline_access. However, please note that Facebook recommends a user-initiated sharing model.

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There is no legal issues there. However users will be pi**ed off. But when you request a token with offline_access and then use that token for publish_stream, your token will not expire.