Friction makes Facebook less addictive by:
1) Dimming alert badges to a calm grey
2) Makes the notification box more boring
3) Auto-hides the newsfeed and adds a delay to loading it
The problem with other productivity apps like StayFocused and News Feed Eradicator is that they don't tackle the main root of why people end up procrastinating on sites: they are deliberately designed to be highly addictive.
Friction for Facebook tries to undo the work of addiction engineers not by forcing you to go cold-turkey, but by adding friction to bad habits and making stimuli less alarming.