Final answer:
The coffee shop's blog aims to collect customer feedback on products and foster customer interaction by allowing them to post ideas on various related topics.
Step-by-step explanation:
The coffee shop's blog serves two main purposes: to gather feedback about products from customers (b), and to encourage customers to interact with one another (d). This online platform allows customers to post their ideas on new coffee drinks, flavor names, and upcoming promotions, which not only helps engage the community by fostering discussion and interaction but also provides the business with valuable customer insights and ideas that can help shape future offerings. The blog does not primarily aim to inform stakeholders about the company's performance (a) or to communicate job openings (c).