Àmì Plugin: facebook meta
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Open Graph Tags
Define and optimize what the Facebook crawler should pick up and show when people share your content.
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WP Author Meta
This is a simple plugin that allows you to set author name that appears in facebook news feeds, when someone shares it on facebook.
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DUZZ
DUZZ adds meta data for SEO and Facebook shares as well as analytics and webmaster tools code to your site and much more.