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    <p>Firstly, the extraData parameter is not passed to facebook. It is for internal use only. See the following link on how this data can be used on your site:</p> <p><a href="http://blogs.msdn.com/b/pranav_rastogi/archive/2012/08/24/customizing-the-login-ui-when-using-oauth-openid.aspx" rel="nofollow">http://blogs.msdn.com/b/pranav_rastogi/archive/2012/08/24/customizing-the-login-ui-when-using-oauth-openid.aspx</a></p> <p>Now, to the meat:</p> <p>In addition to the methods <code>RegisterFacebookClient</code>, <code>RegisterYahooClient</code> etc. in <code>OAuthWebSecurity</code>, there is also a generic method <code>RegisterClient</code>. This is the method we will be using for this solution.</p> <p>This idea germinates from the code provided at: <a href="http://mvc4beginner.com/Sample-Code/Facebook-Twitter/MVC-4-oAuth-Facebook-Login-EMail-Problem-Solved.html" rel="nofollow">http://mvc4beginner.com/Sample-Code/Facebook-Twitter/MVC-4-oAuth-Facebook-Login-EMail-Problem-Solved.html</a></p> <p>However, we will not be using the hacky approach provided by the solution. Instead, we will create a new class called <code>FacebookScopedClient</code> which will implement <code>IAuthenticationClient</code>. Then we will simply register the class using:</p> <pre><code>OAuthWebSecurity.RegisterClient(new FacebookScopedClient("your_app_id", "your_app_secret"), "Facebook", null); </code></pre> <p>in AuthConfig.cs</p> <p>The code for the class is:</p> <pre><code>using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Text; using System.Text.RegularExpressions; using System.Web; public class FacebookScopedClient : IAuthenticationClient { private string appId; private string appSecret; private const string baseUrl = "https://www.facebook.com/dialog/oauth?client_id="; public const string graphApiToken = "https://graph.facebook.com/oauth/access_token?"; public const string graphApiMe = "https://graph.facebook.com/me?"; private static string GetHTML(string URL) { string connectionString = URL; try { System.Net.HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(connectionString); myRequest.Credentials = CredentialCache.DefaultCredentials; //// Get the response WebResponse webResponse = myRequest.GetResponse(); Stream respStream = webResponse.GetResponseStream(); //// StreamReader ioStream = new StreamReader(respStream); string pageContent = ioStream.ReadToEnd(); //// Close streams ioStream.Close(); respStream.Close(); return pageContent; } catch (Exception) { } return null; } private IDictionary&lt;string, string&gt; GetUserData(string accessCode, string redirectURI) { string token = GetHTML(graphApiToken + "client_id=" + appId + "&amp;redirect_uri=" + HttpUtility.UrlEncode(redirectURI) + "&amp;client_secret=" + appSecret + "&amp;code=" + accessCode); if (token == null || token == "") { return null; } string data = GetHTML(graphApiMe + "fields=id,name,email,gender,link&amp;access_token=" + token.Substring("access_token=", "&amp;")); // this dictionary must contains Dictionary&lt;string, string&gt; userData = JsonConvert.DeserializeObject&lt;Dictionary&lt;string, string&gt;&gt;(data); return userData; } public FacebookScopedClient(string appId, string appSecret) { this.appId = appId; this.appSecret = appSecret; } public string ProviderName { get { return "Facebook"; } } public void RequestAuthentication(System.Web.HttpContextBase context, Uri returnUrl) { string url = baseUrl + appId + "&amp;redirect_uri=" + HttpUtility.UrlEncode(returnUrl.ToString()) + "&amp;scope=email"; context.Response.Redirect(url); } public AuthenticationResult VerifyAuthentication(System.Web.HttpContextBase context) { string code = context.Request.QueryString["code"]; string rawUrl = context.Request.Url.OriginalString; //From this we need to remove code portion rawUrl = Regex.Replace(rawUrl, "&amp;code=[^&amp;]*", ""); IDictionary&lt;string, string&gt; userData = GetUserData(code, rawUrl); if (userData == null) return new AuthenticationResult(false, ProviderName, null, null, null); string id = userData["id"]; string username = userData["email"]; userData.Remove("id"); userData.Remove("email"); AuthenticationResult result = new AuthenticationResult(true, ProviderName, id, username, userData); return result; } } </code></pre> <p>now in the </p> <pre><code>public ActionResult ExternalLoginCallback(string returnUrl) </code></pre> <p>method in <code>AccountController</code>, <code>result.ExtraData</code> should have the email.</p> <p><strong>Edit: I missed some code in this post. I am adding it below:</strong></p> <pre><code>public static class String { public static string Substring(this string str, string StartString, string EndString) { if (str.Contains(StartString)) { int iStart = str.IndexOf(StartString) + StartString.Length; int iEnd = str.IndexOf(EndString, iStart); return str.Substring(iStart, (iEnd - iStart)); } return null; } } </code></pre> <p>Cheers!</p>
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    1. COI had an issue with your "token.Substring("access_token=", "&"))" line, since Substring only accepts integers, but this helped immensely. I decided to write a blog post explaining how to extend this a little further, but this post got me 98% there. http://savvydev.com/authenticating-facebook-users-with-mvc-4-oauth-and-obtaining-scope-permissions/
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    2. COApologies. Forgot to include the extension class for string. Adding it to the code now.....
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    3. COThanks, Varun. I had to make a slight tweak for apps being hosted on AppHarbor (which I explain in [another answer](http://stackoverflow.com/a/14567037/389899)) but you did all the hard work.
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