Marketers, "growth hackers", and senators don't get to define spam. Users -- especially those hitting the "spam" button -- define spam. Whether or not somethi

Marketers, "growth hackers", and senators don't get to define spam. Users -- especially those hitting the "spam" button -- define spam. Whether or not something is considered spam depends largely on whose interest you're serving by sending it: the sender's, or the receipient's.