decentralized social network program pump.io has a dislike button. But features like this are implemented as apps, and so you can implement these kinds of featu

decentralized social network program pump.io has a dislike button. But features like this are implemented as apps, and so you can implement these kinds of features however you want. In effect a like or a dislike is an activity post on your own account with a backreference to the content, and others who subscribe to your feed see this. You can't aggregate all data as in a facebook "like" system, but I see this as a feature rather than a bug.