concat, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            foreach(var a in Activities)
                Console.WriteLine(a);
            
            Console.WriteLine("");
            Console.WriteLine("");

foreach(var f in Facebook)
                Console.WriteLine(f);
        }
        
        public static readonly IList<string> Facebook = new List<string>()
        {
            "CommentedOnFacebook",
            "PostedOnFacebook",
            "RepliedOnFacebook"
        };

public static readonly IList<string> Instagram = new List<string>()
        {
            "CommentedOnInstagram",
            "PostedOnInstagram"
        };

public static readonly IList<string> Twitter = new List<string>()
        {
            "PostedOnTwitter"
        };

public static readonly List<string> Activities = Facebook.Concat(Instagram).Concat(Twitter).ToList();

}
}

Show compiler warnings [ + ] Show input
Compilation time: 0,44 sec, absolute running time: 0,09 sec, cpu time: 0,11 sec, average memory usage: 13 Mb, average nr of threads: 3, absolute service time: 0,56 sec