Sharing picture in social Networks.

Hi,
In my webpage , i have social networks links when i click that want to share picture into social networks..
Eg:In shopping card if u click  fb link share that picture in fb same like want to do..
this is my code..but i cant share picture into fb,
<div class="addthis_toolbox addthis_default_style "> <a class="addthis_button_preferred_1"></a> <a class="addthis_button_preferred_2"></a></div>
 <Script>
var addthis_config = { "data_track_addressbar": true };
</script>

Thanks