It's difficult to answer this without the full context or knowing what the business is but I think you can apply "growth hacks" to any business... As an example, a brick and mortar store, or a pop-up food stand can easily tap into current culture and become a viral sensation. This could be done by having viral marketing campaigns like selling a special edition product or having a stand that encourages visitors to share something, using a certain hashtag... The most critical thing is understanding the context around your audience whilst tapping into current trends/conversations. For example, a local burger stand in the UK, could sell a burger called the brexit burger with a flag that customers can choose from, saying "in" or "out", encouraging them to share online with a special hashtag created by the store. As most people already have a strong opinion about Brexit and because it's already very hot topic, people will usually be more than happy to share! It's something they can have a laugh about with their friends and it gives them a platform to express their opinion! Pretty much all growth marketing tactics rely on giving the end-user/customer a platform to express themselves and who they are. It taps into those psychological triggers that make people want to share something. The trick is to get out of your own head and to enter the conversations already happening in your audiences mind.