Topic thread
A topic thread is a string of consecutive message postings to a newsgroup, mailing list, hypermail, blog or Internet forum, linked and sortable by date, author, or subject-heading threads.
Open thread
An open thread can refer to a post where readers may comment and discuss any topic that they choose.
On blogs, open threads are usually more useful on popular blogs with large amounts of traffic; they are often used when the author of the blog has no subject matter to post on, or there is a lull in posting.
Open threads are also used to break up the monotony of posts on the main pages of blogs - comments may build up on content oriented posts therefore authors use the open threads so page load times wont be slowed down.
See also
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