I think the following modules would be great additions due to changes in the SEO landscape:

Google +1 http://drupal.org/project/google_plusone
Readability http://drupal.org/project/readability
Schema.org http://drupal.org/project/schemaorg

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couturier’s picture

couturier CreditAttribution: couturier commented
Status: Active » Closed (duplicate)

I have added these three suggestions to a consolidated list at the following link: 8.x-dev - How to make SEO Checklist the top SEO module for D8