Step 1: Understanding the Question:
The question describes a tool that lets one person keep sharing personal experiences, knowledge, opinions or thoughts with the wider internet community on an ongoing basis.
Step 2: Key Formula or Approach:
Match this description to the correct internet term by checking whether each option is public, ongoing, and centered on one person's regular posts.
Step 3: Detailed Explanation:
A blog is exactly this kind of platform, a website where an individual publishes posts regularly, almost like an open diary, and readers can view and comment on the entries over time.
A portal is a gateway site such as a search or news portal that gives access to many different resources, and it is not built around one person's personal, repeated posting.
Email is meant for sending a message to specific people, so it does not work as a public, ongoing channel to the whole internet community.
Chat is real time and usually private, meant for quick back and forth conversation rather than long term published content.
Step 4: Final Answer:
A blog matches the description of ongoing personal sharing with the internet community, so option (C) is correct.