I don't get these zaps here. What's the difference between (a) an amount of bitcoin so small it means nothing to either side and (b) a like?

I don't see any real difference.

Some people are saying zaps add up, but as far as I can tell from browsing around here the only people for who they add up to more than the value of a ham sandwich per year are obvious douchebags posting some really cringe memes and Freedom Life Advice™.