[wp-meta] [Making WordPress.org] #1526: WordCamp Sites: Open Graph -- add default image fallback when there is no image in the post.

[Making WordPress.org]

#1526: WordCamp Sites: Open Graph -- add default image fallback when there is no
image in the post.
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Reporter:  jeherve      |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  normal       |  Component:  wordcamp.org
Keywords:  has-patch    |
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 See discussion here:
 https://wordpress.slack.com/archives/events/p1453392084003279

 We already have a default Open Graph Image Meta tag added on the home
 page, when you haven't set any Site Logo, or Site Icon on your site.

 It would be nice to have a similar feature on single posts, when no image
 can be found in the post (none was inserted, and no featured image was
 defined).

 The attached patch introduces 4 levels of fallback:

 1. Site Logo -- http://jetpack.me/support/site-logo/
 2. Site Icon -- https://make.wordpress.org/core/2015/07/27/site-icon/
 3. Header Image -- https://codex.wordpress.org/Custom_Headers
 4. Global default OG image -- that's already defined in {{{jetpack-
 tweaks.php}}}, it's a WordPress logo: https://s.w.org/images/backgrounds
 /wordpress-bg-medblue.png

 One concern from our Slack discussion was the following:

 > Though many header images are PNGs which render transparency kinda weird
 on shares (especially twitter)
 -- @marktimemedia

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Ticket URL: <https://meta.trac.wordpress.org/ticket/1526>
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