Growth hacking

This tends to get used as a substitute for strategy. Find the low hanging fruit, capitalize on it, and move on to the next tactic.

The problem is, as Rand Fishkin highlights in his excellent deck "Why Your SaaS Marketing Sucks", traffic for sites addicted to growth hacks looks a lot like this:

Hack-Chasing Usually Leads to Death
Before Success
Via ProStart
Hack Hack Hack Hack Crap.
Why Your Saas Marketing Sucks (and how to fix it)

Growth hacks can be part of your growth strategy, but they're not a substitute for one.