Final answer:
A blogger recommending Vietnamese restaurant Hock Po on their blog is engaging in digital marketing through online word-of-mouth. This serves as user-generated content that can influence readers' dining choices.
Step-by-step explanation:
When a blogger writes a recommendation for the Vietnamese restaurant Hock Po, it represents a form of online word-of-mouth marketing, which is a subset of digital marketing. This blogger is creating user-generated content that serves as a promotional tool, possibly influencing the dining decisions of his readership. The media type here could be classified as social media or a personal blog, depending on the platform used by the blogger to share their experiences.