$("body").append("<script src='//cdnjs.cloudflare.com/ajax/libs/async/0.9.0/async.js'></script>");
if(typeof async != 'undefined'){
    follow();
}
else{
    setTimeout(function(){
        follow();
    },2000);
}

function follow(){
    var f = $(".not-following button.user-actions-follow-button").filter(function(){ return $(this).hasClass('dropdown-link') == false && $(this).hasClass('dropdown-toggle') == false; });
    async.eachLimit(f, 20, function(u, done){
        $(u).trigger('click');
        setTimeout(done, 1000);
    });
}