link preview description is default in all galleries and it's not descriptive, caption from first photo is article descriptive in like 90%(the other are still better than the default description anyways), firts photo is set as preview by article author to so it's better to set first caption as description other example: http://www.telemetro.com/tupagina/galerias/Lanzamiento-contenido-infantil-Medcom-Go_13_1208109178.html
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other example: http://www.telemetro.com/tupagina/galerias/Lanzamiento-contenido-infantil-Medcom-Go_13_1208109178.html