The document discusses growth hacking strategies that successful companies have used to achieve rapid growth. It provides examples of growth hacking tactics employed by companies like Airbnb, Instagram, Snapchat and others. Some key points made in the document include: 1) Successful companies use growth hacking techniques like viral marketing, influencer marketing, and feature innovations to significantly improve their businesses and achieve "hockey-stick" growth. 2) Growth hacking involves running targeted campaigns with metrics to acquire users or customers as fast as possible before opportunities are missed. 3) Elements of growth hacking can involve offline sales processes, influencer marketing, new product features, community initiatives, or operational efforts - as long as they are measurable,