Mastodon link previews for this site were showing a blank image card. The og:image meta tag was pointing at a 1280×1280 RGBA PNG weighing 1.45 MB, which was maybe too heavy for social crawlers to reliably fetch. Hopefully fixed it by generating a proper 1200×630 JPEG (67 KB) and adding the missing og:image:type, og:image:width, and og:image:height tags. 🤞🏻