Instagram widget feed function
first thing one could spot is this duplications:

size = data.data[0].images.standard_resolution.url;
          $("#insta-1").append("&lt;a target='_blank' href='" + data.data[0].link + "'&gt;&lt;img src='" + size + "'&gt;&lt;/img&gt;&lt;/a&gt;");
          size = data.data[1].images.standard_resolution.url;
          $("#insta-2").append("&lt;a target='_blank' href='" + data.data[1].link + "'&gt;&lt;img src='" + size + "'&gt;&lt;/img&gt;&lt;/a&gt;");
          size = data.data[2].images.standard_resolution.url;
          $("#insta-3").append("&lt;a target='_blank' href='" + data.data[2].link + "'&gt;&lt;img src='" + size + "'&gt;&lt;/img&gt;&lt;/a&gt;");
          size = data.data[3].images.standard_resolution.url;
          $("#insta-4").append("&lt;a target='_blank' href='" + data.data[3].link + "'&gt;&lt;img src='" + size + "'&gt;&lt;/img&gt;&lt;/a&gt;");
          size = data.data[4].images.standard_resolution.url;
          $("#insta-5").append("&lt;a target='_blank' href='" + data.data[4].link + "'&gt;&lt;img src='" + size + "'&gt;&lt;/img&gt;&lt;/a&gt;");
          size = data.data[5].images.standard_resolution.url;
          $("#insta-6").append("&lt;a target='_blank' href='" + data.data[5].link + "'&gt;&lt;img src='" + size + "'&gt;&lt;/img&gt;&lt;/a&gt;");
          size = data.data[6].images.standard_resolution.url;
          $("#insta-7").append("&lt;a target='_blank' href='" + data.data[6].link + "'&gt;&lt;img src='" + size + "'&gt;&lt;/img&gt;&lt;/a&gt;");
          size = data.data[7].images.standard_resolution.url;
          $("#insta-8").append("&lt;a target='_blank' href='" + data.data[7].link + "'&gt;&lt;img src='" + size + "'&gt;&lt;/img&gt;&lt;/a&gt;");


One could change it to something more condensed like:

for(var i=0; i&lt;9; i++) {
    size = data.data[i].images.standard_resolution.url;
    $("#insta-"+i).append("&lt;a target='_blank' href='" + data.data[i].link + "'&gt;&lt;img src='" + size + "'&gt;&lt;/img&gt;&lt;/a&gt;")
}


Also creating new nodes multiple time is ineficient since browser will re-paint it every time, so you could change it to (I assume that #insta-X elements are just your way to hook it in some place in html, if that's the only reason you may ditch them and create ie. &lt;div class="insta-container"&gt;&lt;/div&gt;)

links = "";
for(var i=0; i&lt;9; i++) {
    size = data.data[i].images.standard_resolution.url;
    links += "&lt;a target='_blank' href='" + data.data[i].link + "'&gt;&lt;img src='" + size + "'&gt;&lt;/img&gt;&lt;/a&gt;";
}
$(".insta-container").append(links);


Also it looks like with size you accidentally declare global variable (window.size) - not a good idea - you need to make var size to make it local: 

loadImages: function (userID) { // Get user photos
      var size, //declare local var, then use it as before
          getImagesURL = "https://api.instagram.com/v1/users/" + userID + "/media/recent/?access_token=" + accessToken + ""
      ;


Also you may want to read about hoisting to know those var ... declarations should be at the top of your function.