A simple extension method to replace the async event based get requests from facebook C# sdk to a async task based.

t.cs

    static class FbServiceClientAsync
    {
        public static Task<FacebookApiEventArgs> DoGetAsync(this FacebookClient client, string getPath, object parameters = null)
        {
            var tcs = new TaskCompletionSource<FacebookApiEventArgs>();
            var obj = new object();

            EventHandler<FacebookApiEventArgs> eventHandler = null;
            eventHandler = (s, a) =>
                {
                    //
                    //  Only finish when the UserState is the same as the object created on
                    //  method call, to prevent handling an incorrect callback.
                    //
                    if(!obj.Equals(a.UserState))
                        return;

                    if (eventHandler != null)
                        client.GetCompleted -= eventHandler;

                    tcs.TrySetResult(a);

                };

            client.GetCompleted += eventHandler;
            client.GetAsync(getPath, parameters, obj);

            return tcs.Task;
        }


    }