I like this.
Zapping as a silent acknowledgement/ appreciation without feeling force to reply filler text for the sake of replying

I zap to acknowledge that a stacker has read and commented but not all comments need a reply. A zap is a proxy for thanks in my opinion. 

grayruby

Zapping all comments is something I absolutely agree with. I've zapped all the comments I've replied to, but not all those posted. I should adopt your practice. In my opinion it is fair to zap all comments and reply to as many as possible.