Blog
On many blogs, the person reading the posts can leave comments, which are notes in which a person says what they think about the blog post. This makes blogs good for discussion — if someone writes something that someone else does not believe to be true, someone else can fix it by writing a comment on that blog or on their own blog. Someone else cannot change what the post says, but the writer of the post can. Not all blog posts need to be talked about or fixed. But if there are a lot of people interested in a topic, they can start a discussion on the original blog, on their own blogs, or both. These people can discuss a topic or their point of view.