It came and it went
The syndication-source meta tag was introduced alongside the original-source tag in November 2010. It was an initiative to help identify original sources of news (to be used by news publishers) and to be used within Google News. However, on 1st June 2012, Google announced in a Google News Help Forum thread that “the tag has been deprecated”. They experimented with the tag and decided in a little over 18 months that it just wasn’t working. They also mention that news publishers could now use the “existing guidance in this area for Google Web Search”, i.e use the canonical tag (attribute).
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