Android social apps: ability to post on behalf of the user?

Ever since I purchased my Samsung Galaxy SIII, it has been displaying a notification which when clicked causes an app to be displayed asking me to log in to Facebook and then displaying the following screen, which asks me whether I want to allow my Samsung Galaxy SIII to post to Facebook for me (the app is different from the Facebook app which can be downloaded from facebook, as there is a separate button to install the Facebook app, and the app asking me this question appears in the Android Task Manager under the name SNS (Social Networking Service) with a Facebook icon next to it):

If I say yes in the last screenshot above, will my device be posting posts to Facebook without my approval with content I have not even seen?

Thank you for clarifying my suspicion.