zap leaderboards only make sense in a web of trust setting unfortunately, since untrusted zappers can fake zaps.
Discussion
#Zapwashing 
They can fake zaps, they can self zap… in the end there are many other metrics that can be used to gauge engagement.
This is nothing new in the media world. New York Bestsellers and their publishers all mass buy their own books to stuff their numbers. The major music and film industry companies also do this with their own library to fix the Billboard, etc charts. It’s totally ridiculous, but the world is rigged like this.
Same as twitter polls right?