I'm trying to write a simple jQuery function to click on the "following" buttons of Medium. I wrote this but it returns "Uncaught ReferenceError: jQuery is not defined"
__cnt__ = 0;
jQuery('.button-activeState').each(function(i, ele) {
    ele = jQuery(ele);
    if (ele.css('display') != 'inline') {
        //alert('already following:', i);
        return;
    }
    setTimeout(function() {
        ele.click();
    }, __cnt__++ * 500);
});
What am I doing wrong?
 
     
     
    