The big sites that I’ve been blessed to work on always had a supplementals-related issue and it’s one area of SEO I’m paying more attention to these days. I always thought it was somehow related to these factors:
- too high page similarity scores
- non-unique TITLEs
- weak internal/external link popularity
But don’t take my word for it. Here’s a far more comprehensive supplementals factors/solutions list from Halfdeck (grab the feed, you can thank me later).
Hat tip to DazzlinDonna.









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