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Interesting discovery; automated posting with IFTTT doesn't trigger a full Facebook crawl or cache. Likely a logical security precaution.
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It's an obvious thing for Facebook to do, I just had never really thought about it before.
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Result: shortening service links like bitly that get robo shared don't get crawled and their full links don't resolve in the share card.
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There is so much interesting logic in when Facebook crawls and caches things.