Icons in the Upper Right Corner: the Thumb tack (Bookmark), RSS Feed, Search this Site, etc
...ike a sprocket (circle with bumps on it)-- is a gear that lets you get into the engine of it's corresponding page/item and tinker with its "SETTINGS"  ...The "Activity Page"- Where the Action happens-- also A quick way to comment, & other Icons
...riginal poster set the Photo to "Friends" only his/her friends will see that photo- even if you check "all" activity, it is private to you. Settings YOU can set when you post som...