Try follow in robots.txt
User-agent: Facebot/1.0 Crawl-delay: 1
User-agent: Facebot/1.1 Crawl-delay: 10
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Try follow in robots.txt
User-agent: Facebot/1.0
Crawl-delay: 1
User-agent: Facebot/1.1
Crawl-delay: 10