You are using css to display none we don’t need to use show() function.

Please click on javascript icon in fiddle and select any jquery1.9.1 or above version . Update this code and run ( http://screenshotlink.ru/8f491216a33e437f762eb8815efec77d.png )

$(document).ready(function(){

   $('.share-icon').on('click',function (e) {
       var id = $(this).attr("id").split('-'); 
      $('.post-share#post-share-'+id[2]).css("display","block");
   });

});