thank you now the image and product info appears in Facebook's wall when share any product with the addshoppers buttons
copy in Product.tpl
PrestaShop
<div itemscope itemtype="http://schema.org/Product" style="display: none;">
<span itemprop="name">{$product->name|escape:'htmlall':'UTF-8'}</span>
<span itemprop="description">{$product->description|escape:'htmlall':'UTF-8'}</span>
<img itemprop="image" src="{$link->getImageLink($product->link_rewrite, $cover.id_image, 'large')}"/>
<div itemprop="offers" itemscope itemtype="http://schema.org/Offer">
<span itemprop="price">{convertPrice price=$productPrice}</span>
</div>
</div>