IB Business Management SL 4.5.5 Promotion Questions

The Burnt Tomato (BTO)
In 2003, Ben opened a street-food stall selling vegan food. The food stall was successful. Ben spent little on marketing, mainly advertising on the food stall itself and relocating it to places or events where many consumers would pass by.
In 2008, Ben used the profits from the food stall to open a restaurant, The Burnt Tomato (BTO), which initially employed 16 people. In the following years, labour turnover was low. Employees received an annual bonus, which increased with each year of employment.
In 2015, Ben created a website and began to use social-media marketing. Customers were encouraged to rate their BTO experience online. Their reviews consistently rated BTO's experienced staff highly and showed that they thought the food was exceptional value. Ben replied to all reviews. Many BTO customers also joined a BTO social media group and communicated with each other and BTO regularly. For many customers, the total BTO experience of vegan food and social networking was like being in a club.
Unfortunately, high labour costs, reasonable profits and the use of high-quality ingredients meant that BTO's gross and net profit margins were below industry averages.
Aware of the growing demand for vegan food, Ben borrowed money from a family member in 2018 and opened two more BTOs in different cities, hiring 32 new employees. However, in January 2019, a long-time customer of the original BTO ate at one of the new restaurants and wrote a negative review. The review went viral and sales at all three BTOs declined.

Explain one advantage and one disadvantage for B T O as a result of its use of social media.