Getting image from link setting it to a box?

I've been at this for 3 hours now and no success. I'm trying to get an image from my facebook page and set the box's texture as my picture. First I started getting constant stackflow exceptions. After I fixed that, I started getting null pointers. For some reason Unity just can't get the image. I feel as if i'm going in the wrong direction.

Facebook graph links:

https://graph.facebook.com/chernobyl360
https://graph.facebook.com/chernobyl360/picture

Code (csharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class fb_call : MonoBehaviour
5. {
6.  
7.     public string fb_graph_call_url = "https://graph.facebook.com/"; //GENERAL CALL OF GRAPHS
8.     public string fb_player_id; //PLAYERS ID
9.     public string fb_pic_call = "/picture"; //PICTURE CALL
10.     public string fb_id_call; // FB_GRAPHCALL_URL + FB_ID_TEST || CALLS PLAYER PAGE
11.     public string fb_profile_picture;
12.     public Texture2D fb_pic;
13.     // Use this for initialization
14.     void Start ()
15.     {
16.         fb_player_id = "chernobyl360";
17.         fb_id_call = fb_graph_call_url + fb_player_id;
18.         fb_profile_picture = fb_graph_call_url + fb_player_id + fb_pic_call;
19.         FB_Profile_Pic ();
20.     }
21.  
22.     IEnumerator FB_Profile_Pic ()
23.     {
24.         WWW pic_url = new WWW (fb_profile_picture);
25.         yield return pic_url;
26.        
27.         pic_url.LoadImageIntoTexture (fb_pic);
28.     }
29.    
30.         void OnGUI ()
31.     {
32.         //GUI.Box(new Rect(0, 0, 50, 50), facebook_caller.twit_pic, social_style);
33.        
34.         GUI.Box (new Rect (0, 0, 50, 50), fb_pic);
35.  
36.     }
37.     // Update is called once per frame
38.     void Update ()
39.     {
40.  
41.     }
42. }
43.  

 

Any help would be greatly appreciated. i'll give this another shot on my own but I feel that i'm not either going in the right direction or i'm completely not understanding how to WWW.texture works.