1. Today, @Jason's voicemail got "hacked" by a YC-alum looking to get attention for his new product in the name of a growth hack. (http://webcache.googleusercontent.com/search?q=cache:QkTa-zWgIh8J:https://medium.com/%40avizolty/my-investment-hack-jason-calacanis-voicemail-e4b414659ad7)2. We've seen plenty of stories about growth hack spamming of all sorts, especially for mobile virality.
There are plenty of details we could debate about specific nuances, but at a high/paradigm level, when is a "growth hack" appropriate or inappropriate?