Use Signalr to have a facebook like notification system

I want to implement a facebook like notification system in ASP.NET MVC 3 : notifications are sent to a specific user to notify him for an action on one of his items.

Is signalr suited for such requirement? How could i send a notification to a specific user (all opened sessions of this user) using SignalR?

Edit

Ok, Here what i did

In the client side

$(function () {
// Proxy created on the fly
var chat = $.connection.chat;
var username = '@Html.ViewContext.HttpContext.User.Identity.Name';
// Declare a function on the chat hub so the server can invoke it
chat.addMessage = function (message) {
     $('#messages').append('<li>' + message + '</li>');
};
// Start the connection
$.connection.hub.start(function (){
    chat.join(username);
});

});

In the server side

public class Chat : Hub
{
    public void Join(string username)
    {
        AddToGroup(username);
    }
}

And every time i need to notify a user in the controller i do the following:

IConnectionManager connectionManager = AspNetHost.DependencyResolver.Resolve<IConnectionManager>();
dynamic clients = connectionManager.GetClients<Chat>();
clients[username].addMessage("test");