Well, for starters, when you click the "Blog this Post" button thingy, it automatically "quotes" said post when it becomes a blog entry. As to why people do it: I'd wager that it has something to do with the fact that some members here on ZD are excellent posters, and said posters want their posts to be seen. This is quite understandable, seeing as how easily good, must-read posts can be lost in threads, especially those that become defunct after quite some time. I myself have blogged one of my posts. I felt like my post needed more publicity, because it addressed an issue involving the spoiler policy and some of its flaws. I thought it was important that it be seen, given the abundance of spoiler threads that appeared circa-the release of Skyward Sword...You know what I don't get? People who post something in some thread, quote that post, and re-post it in a blog. It makes no sense to me.