Hello. I'm a developer at reddit, and this morning I was looking into how we generate thumbnail images from Wikipedia (and I suppose all Mediawiki) articles, due to a user report that they had an unexpected thumbnail on their submission[0]. You can read my post there for more details, but essentially since we can't find an og:image or other similar metadata tag hinting to us what we should use for a thumbnail, we iterate through all the linked images on the page and pull out the largest one (you can view the code online if you're curious[1]). While this works reasonably well as a general heuristic, Wikipedia articles often have some more structure that could give us a better image to use. While writing this, I recalled that the Wikipedia Android app displays thumbnails in its search results. I think that's pulling from OpenSearch with the PageImages extension[2]? but I haven't really delved into that yet. I'm curious how those images get pulled - if it's taking into account infoboxes or such, or just the first image on the page, or what. Would it be feasible to include an og:image tag on pages for which we have a reasonable guess as to the thumbnail? Open Graph[3] is supported by what seems anecdotally to me to be a wide range of services, so good hints there would improve thumbnails for links on not just reddit, but Facebook, Twitter, various chat clients, I think several Wordpress plugins, etc. Thanks, - P [0]: https://www.reddit.com/r/bugs/comments/317n1v/thumbnail_acquisition_from_wi… [1]: https://github.com/reddit/reddit/blob/master/r2/r2/lib/media.py#L485-L542 [2]: https://www.mediawiki.org/wiki/API:Opensearch [3]: http://ogp.me/