Google no longer recommends canonical tags for syndicated content
Google now says the canonical link element is not recommended for syndicated content; instead, block the syndicated content from being accessed to avoid duplication. Google posted this new piece of information in this help document over here.
What’s new. Google posted this paragraph under the section “syndicated content:”
“The canonical link element is not recommended for those who wish to avoid duplication by syndication partners, because the pages are often very different. The most effective solution is for…