"We limit the amount of information in notifications because we want people to come onto the site"
Internal document
"We limit the amount of information in notifications because we want people to come onto the site. A few years ago we stopped sending out emails telling you what happened – e.g. telling you what your friend did – instead we just say 'someone commented on your post,' in the hope that you'll click through. This is a clear value-engagement tradeoff. We see similar effects on push notifications about friend activity: when we send fewer notifications, that increases engagement because people come to the site to check what's happening"