Why can't the search engine search QQ space? Is it not open to the public?

Because there are many private things in the space, all the spaces are blocked by default from being crawled by search engine spiders, and all of them can't be searched by search engines, but you may see that many people in Shanghai have titles in search engines, because they block their space, that is, they change all the accessible things in your space into accessible ones, and don't set any photo albums and passwords to access rest. After submitting your space to the search engine, the search engine can grab your space. I hope my answer can help you.