Stop displaying Facebook game activity to friends
Recently, I just realize that the Game Activities are available on my right Facebook panel (Game Ticker). Due to certain reason, I prefer to keep all this info to myself. For that reason, just simply click on the (x) mark that appears. Next, click on ‘Don’t publish is playing (Game name) posts. Afterward, there will be not be seen for that particular game on the games ticker.
A closeup view of Game Ticker