You are adding all elements together in loop.
Re-Create elements & add separately.
DEMO: http://jsfiddle.net/82wNq/30/show/
CODE: http://jsfiddle.net/82wNq/30/
function (data) {
var temp = "";
$.each(data.streams, function (index, item) {
temp = temp + "<div class='panel-heading'><h3 class='panel-title'></h3><div id='content1'>" + item.channel.display_name + "</div><div id='content2'>" + item.viewers + "</div></div><div class='panel-body'><div id='content3'><img src='" + item.preview.medium + "'/></div></div>";
});
$("#content").html(temp); }