Hi!

The pelican-open_graph plugin adds OG tags to the generated content, as does the SEO plugin. However, there are a few differences:

• pelican-open_graph adds the site_name tag
• pelican-open_graph defaults to the article summary for og:description, whereas SEO uses the og_description or description metadata.
• pelican-open_graph generates tags for the Article content type (https://ogp.me/?#no_vertical)

Being the maintainer of pelican-open_graph, I am proposing to deprecate it and merge its functionality into the SEO plugin. I have prepared three pull requests to achieve this: #77, #78 and #79.

Please have a look at them and let me know what you think about merging the plugins.