I'm using iPhoto since years for collecting and managing all of my pictures.
Some years ago I allowed iPhoto to connect to Facebook in order to sync pictures and compare names with faces.
After soe weeks I just deleted this function in order to let iPhoto manage my pictures and faces alone.
Now after the last update of Mavericks and iTunes I'm quite wondering why iTunes displays all the delected faces from the facebook integration years ago as an option to sync faces to my iPhone. (but this faces or even names are no longer available in iPhoto library)