Newsletter signup (with exclusive discounts): https://signup.iamtimcorey.com/ (your email will be kept safe and you will not be spammed).
Twitter App Signup: https://apps.twitter.com
Twitter Certificate Fix: https://stackoverflow.com/questions/25011890/owin-twitter-login-the-remote-certificate-is-invalid-according-to-the-validati

Setting up an ASP.NET MVC site to allow people to log in is not that hard. In this video, I demonstrate how you can set up a login system for users, how you can upgrade that system to include Twitter authentication (using OAuth), and then how you can lock down your site to only allow certain people access to certain areas. We will create security groups and lock things down even further.