IdentityUser add friend (IdentityUser to)

See more:

C#

ASP.NET

MVC

entity-framework

Hello guys,

I'm making a mini social network to learn MVC and EF.
So, a user can add other users

My question is:
- I create a new model UserFriend and i use like this:

public class UserFriendCollection : Collection<UserFriend> { }
 public class UserFriend
 {
    public int UserFriendID {get;set;}
    ...
 }

   public class ApplicationUser : IdentityUser
   {
       public UserFriendCollection Friends { get; set; }
       public string FirstName { get; set; }
       public string LastName { get; set; }
       public string Email { get; set; }
   }

or

- I use the same model IdentityUser , like this:

public class ApplicationUserCollection : Collection<ApplicationUser> { }

   public class ApplicationUser : IdentityUser
   {
       public ApplicationUserCollection Friends { get; set; }
       public string FirstName { get; set; }
       public string LastName { get; set; }
       public string Email { get; set; }
   }

thankss