Some WordPress Core widgets are far from SEO friendly, the worst three widgets are the Calendar widget (daily archive links), Archives Widget (monthly archive links) and the Meta Widget (links to the WordPress login Page, Post Feed, Comments Feed AND a link to WordPress.org!!!).
Best SEO practice is to not use the Calendar Widget, the Archives Widget or the Meta Widget. All three waste link benefit (PageRank : PR) and add content that damages a sites overall SEO (the anchor text of the links isn’t helpful to your Posts etc…).
Do NOT use these WordPress Core Widgets.
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