Iam using setinterval for autorefreshing but it showing my JSON data repeatedly

Iam using setinterval for autorefreshing but it showing my JSON data repeatedly

JSON:

"Facebook": [
        {
            "facebook_name":"Apple",
            "facebook_post":"Apple posted a photo",
            "facebook_comment":"Apple commented on a photo",
           
        },
        {
            "facebook_name":"Mango",
            "facebook_post":"Mango posted a photo",
            "facebook_comment":"Mango commented on a photo",
          
        }

        ]
}
Script:
$(document).ready(function () {

    var facebook=null;

    var array=null;
   function refreshEachMinute(){
        $.ajax({
            type: "GET",
            url: "../data/data.json",
            dataType: "Json",
            cache:"true",
            success: function (msg) {

                facebook = msg.Facebook;

                $.each(facebook,function(index,value){
                    var array=[];
                    //facebookupdater(facebook,value);
                    var name=value.facebook_name;
                    var post=value.facebook_post;
                    var comment1=value.facebook_comment;
                    var share=value.facebook_share;
                    // console.log(name);
                    // console.log(post);

                    array.push(name,post,comment1,share);
                    // console.log(array);
                    for ( var i in array ) {
                        var facebook_array=   ( array[ i ] );
                        console.log(facebook_array);
                        $('#facebook').append(facebook_array);
                        $('#facebook').append("<br>");
                       // setInterval('$("#facebook").show("slow")',500);
                      //  setTimeout('$("#facebook").hide("slow")',500);

                    }


                    // $('#facebook').html(name);
                    //$('#facebook').html(post);
                    //$('#facebook').html(comment1);
                    // $('#facebook').html(share);
                })

            }

        });
    }
    var interval=setInterval(refreshEachMinute, 30);
    //clearTimeout(refreshEachMinute,30);

    $(function() {

                    refreshEachMinute();

    });

   //clearInterval(interval);

});