It's when you constantly post without any real purpose or effort in order to increase the amount of posts you have.
It helps some people feel popular I guess
As said in the ice moths thread "as of 10:30 pm (gmt) ice moths will stop dropping from epic battles and wars" I know it's not really an answer but I think that of you start an eb before the promo expires and the eb ends after the promo finishes you will not get moths from it.