What's a blog?
A blog (short for weblog) is a space online where people write posts about various topics, depending on their interests. Blogs can range from purely opinion-based to research-based posts that rival some journal articles.
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What's a Forum?
A forum, also known as message boards, is a place where people can come together online to discuss issues and get questions answered. Forums can be moderated, meaning that some people are designated moderators to ensure that people follow the forum's code of conduct. Other forums are unmoderated.