Yes this is a great fallback.
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Also apologies I forgot we added that other per-category social media share image setting. I kinda blacked that out due to trauma over the earlier discussion 
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When working on adding this feature I caught a bug. I noticed that right now here is how we prioritize OpenGraph image: first post image > opengraph_image > twitter_summary_large_image_url > site_apple_touch_icon_url.
And https://discourse.codinghorror.com did had the site_apple_touch_icon_url so the twitter:image tag was present <meta name="twitter:image" content="/images/default-apple-touch-icon.png" />.
Turns out Twitter does not support relative image paths. This is now fixed via:
https://github.com/discourse/discourse/commit/f83533e1cb5ff262cb25d9392bc2dcc1621fb0ab
Above commit also adds logo_url as last resort for OpenGraph/Twitter image tag. This updates opengraph image priority to: first post image > opengraph_image > twitter_summary_large_image_url > site_apple_touch_icon_url > logo_url.
Verified the fix on https://discourse.codinghorror.com:
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When set, the large_icon may be preferable than site_apple_touch_icon_ur because it’s larger. Also we did bug everyone to set it already.
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I added the large_icon as fallback. The new priority is: first post image > opengraph_image > twitter_summary_large_image_url > site_large_icon_url > site_apple_touch_icon_url > site_logo_url .
https://github.com/discourse/discourse/commit/ec7f418a22188bcdf7749c8bb75d8d3ddc2927b0
This also removes the warning that has been flooding the logs.
SiteSetting.logo_urlhas been deprecated and will be removed in the 2.4 Release. Please useSiteSetting.logoinstead
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Many of the posts in our community may contain several images.
Is there a way to tag an image or define, for a specific topic, which image to use for opengraph and social sharing?
Also, the Topic List Previews (by @merefield and @angus) plugin takes the first image in a post and uses that for the thumbnail or tile image. I’m wondering if there’s a way to tell the plugin to use the 2nd, or 3rd, or 8th image, etc.
btw @codinghorror, I got to test out that Better Insert Hyperlink feature from the 2.4 release, above, to find Topic List Previews plugin discussion, and right here with this hyperlink. Snazzy new feature!! 
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That’s already in the plugin. I added a thumbnail picker last year 
(btw, I’ve not considered how that might impact social sharing, feel free to experiment!).
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Yes – the first big image is the one that is used. So make sure the most important image is first (and large enough, tiny images won’t work).
@merefield and @codinghorror - I can confirm that using the Topic List Previews tool not only allows you to select which image you would like to use as the featured image for your thumbnails but when doing so, that image you select will also become the image that appears for opengraph and social sharing, instead of the default setting of displaying the first image in the post!
Here’s an example where I’ve chose to use the 8th image with the “Select Thumbnail” feature and here’s how the post now appears when sharing (and on my “Latest” topics page):
Here’s how to select a thumbnail image, using the Topic List Preview plugin…
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For the record: Discourse Core has the ability to do this since February 2021. We may look at making it more discoverable in future, but for now you can manually edit the markdown of the image and set one as the thumbnail.
By default Discourse will use the first image in the OP of the topic. If you would like to select a different image from the OP, add |thumbnail to the markdown. For example
 << this one will be the thumbnail
(this was originally discussed over in the official Topic List Thumbnails topic, but this core thumbnail selection feature isn’t specific to that theme component)
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