We're sharing data on facebook using open graph meta tags. After initial crawl for how long link with the document should stay valid? Is it just stored in open graph and if the content do not change I don't need to care about it anymore? I couldn't find information about it in open graph documentation but it was probably me being lousy in looking for it
For how long open graph link should be accessible?
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As @CBroe said, Facebook will re-scrape an Open Graph objects (i.e. an URL) if any action is taken on it (share, like, etc.) and the last scrape for that object is more than 7 days old.
If the Facebook crawler returns an error in one of those re-scrapes (for instance, because the URL is not longer available) the action over that object will fail.