Social network Facebook has updated its iOS app to v6.2, which brings new access to change who can see something a user has shared, the ability to start a conversation based on photos users receive in messages, and the addition of icons to status updates that show emotions or what a user is reading or watching. The “status update icons” were added to the desktop version of the program in April, but mobile support has been missing until now. The update also includes the usual bug fixes, and the app can be downloaded for free from the App Store….