跨域内容复制和SEO
我们有一系列具有共享内容的网站（关于游戏）。每个站点都有自己的顶级域，大多数内容都有一个“主”域，但所有内容都可以在每个域上访问。这允许登录棋盘游戏网站的用户翻阅其新订阅的内容并查看有关角色扮演游戏或视频游戏的页面（基于我们另一个域的内容），而无需跳转到另一个域领域。
我担心这些重复的内容会被用来惩罚我们的搜索引擎排名。规范链接不能跨域工作。 Google 建议使用 301 重定向来强制所有用户访问特定页面的单个域，但我们不想这样做，因为我们不想强迫用户离开他们的首选域。此外，我们还有真正属于多个域的其他内容 - 例如，可能包含来自多个域的游戏的列表。
我们如何才能继续以这种方式展示我们的内容，而不会因跨域重复内容而受到惩罚？
We have a family of sites (about games) with shared content. Each site has its own top level domain, and most content has a "home" domain, but all content is accessible on each domain. This allows a user who is logged in on, for example, the board game site, to page through their new subscribed content and see pages about RPGs or video games (content that is based in another of our domains) without having to jump to another domain.
I am concerned that this duplicate content will be used to penalize us in search engine rankings. Canonical links do not work across domains. Google recommends using 301 redirects to force all users to a single domain for a particular page, but we do not want to do that because we don't want to force users off their preferred domain. In addition, we have other content that genuinely belongs to multiple domains--lists that might include games from multiple domains,for example.
How can we continue to show our content in this way, without being penalized for having duplicate content across domains?
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读过这篇文章，Google确实支持跨域规范。因此，只需将其指向单一事实来源即可！
http://searchengineland.com/google-supports-cross-domain-规范标签-32044
Have a read of this article, Google does support cross domain canonical. So just point it to the single source of truth!
http://searchengineland.com/google-supports-cross-domain-canonical-tag-32044