You seriously don't know? Well usually, if someone intends to post something at someone, but another person has posted before them by the time the first person finishes their post. Example: *A looks at B's post* *C looks at B's post* *A starts a post in reply* *C starts a post in reply* *C finishes its post first* *A then finishes its post* *C posted before A so A's post doesn't make sense anymore* *A has to change its post* So C is a ninja because it is faster.
Sorry for the long explanation. Someone is probably gonna ninja me now.
*throws peace at syyyr*