Simple Google+ API Calls from C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Google.Apis.Plus.v1;
using Google.Apis.Plus.v1.Data;

namespace EasyPlus
{
    internal class Program
    {
        // From https://code.google.com/apis/console
        public const string API_KEY = "YOUR_API_KEY";

        private static void Main(string[] args)
        {
            // A service object for basic API calls.
            PlusService plusService = new PlusService(
                    new Google.Apis.Services.BaseClientService.Initializer()
                    {
                        ApiKey = API_KEY
                    });

            // List the activities for a user (+GusClass in this case).
            IList<Activity> activities =
                plusService.Activities.List(
                    "+GusClass",
                    ActivitiesResource.ListRequest.CollectionEnum.Public).
                    Execute().Items;

            // Print the activities.
            foreach (Activity act in activities)
            {
                Console.WriteLine(act.Title);
            }

            Console.Write("Press any key to continue...");
            Console.ReadLine();
        }
    }
}