facebook - FB.UI big thumbnail for link -

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how share link big thumbnail picture. using java sdk fb.ui feed method?

no matter how big picture put thumbnail, facebook in feeds not appear big thumbnail.

            fb.ui({                 method: 'feed',                 name: 'name',                 link: link,                 picture: picurl,                 caption: 'caption',                 display: 'popup',             }, function(response){console.log(response);});

use 2x1 ratio pic

like 800pix 400pix image on ur wall ll crop square on news feed big central image url underneath. don't forget set meta tags of url page


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