Hera's Kitchen, a fast-food chain, frequently updates photos of its signature dishes on its blog and moderates a page where its customers can share opinions and give feedback. In this case, Hera's Kitchen is using .
1. social media marketing
2. product adaptation
3. decentralized marketing
4. countertrade

1. Social media marketing

Explanation:

Social Media Marketing

This involves the use of social media platforms and websites in advertising and promoting a product or service. In a world dominated by the internet today, social media marketing is becoming enormously popular across all sphere, from practitioners to researchers. It involves the creation and sharing of content on social media network in order to achieve marketing and branding goals.

Here, Hera uses social media as a marketing tool by posting dishes on her blog to reach a wide range of audience and in doing so, also getting feedbacks and opinions from the audience.