Before V1.4, site setting title is not only used for displayed in Home Page and Navbar, but also used to generate the <title> in HTML.
It's possible that you want the two things different. For me, my site-title is “ZeFeng Blog” but I want the title shows in search engine is “陈泽锋的博客 | ZeFeng Blog” which is multi-language.
So, the SEO Title is introduced to solve this problem, you can set SEOTitle different from title, and it would be only used to generate HTML <title> and setting DuoShuo Sharing.
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