Authentication is hard and important. So this is not the right time to re-invent the wheel (besides...it's already invented!)
Passport.js will cover all your Authentication needs you have making figuring out who's logged into your website so easy you'll ask everyone to login!
Our guest speaker, Steve Smodish, will show us how he's implemented Google login and show us how we'll be able to use Twitter and Facebook login integration with just a couple of lines of code
Passport.js can be found at: http://www.passportjs.org/
You can find Steve's Github at: https://github.com/ssmodish