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Dear developers, could you please review whether this can merge?

> 那你试试 cool_blog.xxx.com 能不能用，如果能用就没问题。  帮楼主试了下，确实不行。但确实存在包含下划线的二级域名。 - https://stackoverflow.com/questions/2180465/can-domain-name-subdomains-have-an-underscore-in-it - https://my_sarisari_store.typepad.com/

@HtnrxUNc 应该是因为“typora 导出的 html 格式与 typecho 冲突”造成，建议你直接以 markdown 方式发布。

Thank you @liuyuanzhi-cn, this PR seems to be related to #335

Email and username must be unique, modifying the database directly can be dangerous. Add the "Edith profile" menu in `Admin -> Users` for easy solving.  

Hi @prithvidasgupta, is there any updates on the progress?

@prithvidasgupta It doesn't matter. It's okay.

Hi @sosyz, I updated some ideas. When question A references the link of question B, A will be associated as a backlink to B and displayed on the page of...

> supporting associations via hashtags (e.g., starting with #) or question links I agree and have no suggestions for now. > Perhaps we need to add some hidden payload to...

When sorted by active, it shows the users who interacted last.