Facebook spam from Zoosk
Originally uploaded by thatjonesboy.
This poor friend's Facebook news feed has been overwhelmed by notification messages from another Facebook spam app, a dating site, zoosk.com.
Facebook could easily control this by limiting the number of times in a period that any one third-party app can add stuff to your mini-feed, but it appears they haven't/won't.
Again, a case of not caring enough about the user experience for a business valued entirely on the number of users x the amount of time they spend on the platform.