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Just as today, for every post there is an inline control beside it that shows you who can see it and gives you the option of changing it.
Apps are a big (optional) part of the Timeline. After you approve an app, whenever you take an action using the app, a story is seamlessly published to your Timeline.
Whenever you add an app to your Timeline, you can feature your favorite activities, such as listening to music, watching movies, or reading books.