Blogs can do that.

Blogs or "weblogs" are very easily-created personal websites containing "posts" which are regularly and frequently updated in the form of a diary or journal, showing the most recent posts at the top of the page. They can be run by one person or by a group of people who are invited to participate, and visitors can leave comments, thus creating a real space for discussion and collaboration. Blogs are archived, and access to these records of postings allows for consultation and research.