When I paste a link on my Facebook automatically reads the url and assigned me a picture of them on my server etngo as I can do to take a default image.
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Yes, set your og: tags on the web page. See https://developers.facebook.com/docs/opengraph/ pay attention to og:image.
DMCS
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Thanks for answering, now how long it takes to update the cache of facebook? – Luis Ruiz Figueroa Jan 08 '12 at 05:34
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Lint the URL, and the cache is flushed immediately. https://developers.facebook.com/tools/lint – DMCS Jan 08 '12 at 11:02