LinkedIn link previews: which OG tags LinkedIn reads and which it ignores
LinkedIn uses og:title, og:description, and og:image for link previews in posts, articles, and messages. It ignores twitter: tags entirely. The image must be at least 200x200 pixels, but LinkedIn recommends 1200x627 (a slightly different aspect ratio from the standard 1200x630). Images over 5 MB are ignored.
How this is calculated
LinkedIn's Post Inspector (the debugger at linkedin.com/post-inspector) lets you preview and refresh your OG tags. Unlike Facebook's Sharing Debugger, LinkedIn's cache is relatively short (roughly 7 days), and the Post Inspector forces an immediate refresh. LinkedIn also has a maximum title length of roughly 200 characters and a description limit of roughly 300 characters before truncation. If og:image is missing, LinkedIn shows a grey placeholder. For company pages and articles published directly on LinkedIn, OG tags don't apply because LinkedIn generates the preview from the article's own metadata.
Verdict
LinkedIn is the most straightforward platform for OG tags. Use a 1200x627 image, keep titles under 200 characters, and test with the Post Inspector. No need for platform-specific tags beyond the standard og: set.