In the earliest stages of your startup, I believe that you need to focus on creating something that consumers love. Marketing an tracking growth should not be a priority.

Successful startups create wealth by creating a product desirable to the consumer and by growing their user base. Only after that should focus be placed internal and external growth. 

Take for example Facebook and AirBnb. They created products that people obsessively talked about, growing their business exponentially through word of mouth, rather than using inorganic marketing schemes, such as advertisements to maintain user traffic. 

Emphasize the product and rapidly test it. Emphasize on making the consumer fall in love with whatever you're making.