At f8, we introduced new ways for people to control exactly how apps post back to Facebook.
We’ve found that stories people choose to explicitly share from third party apps are typically more interesting and get more engagement in News Feed than stories shared from third party apps without explicit action. We’ve also heard that people often feel surprised or confused by stories that are shared without taking an explicit action. In the coming months, we will continue to prioritize explicitly shared stories from apps in News Feed over implicitly shared stories.
This means people will see fewer implicit stories from third party apps in the future. However, people will continue to see interesting and relevant content from third party apps that their friends have explicitly chosen to share. You can read more about this update on our Developer Blog here.