Hello,
Read this link, it describes how to use OAuth
http://blogs.msdn.com/b/webdev/archive/2012/08/15/oauth-openid-support-for-webforms-mvc-and-webpages.aspx[
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Basically all you need to do is use the Microsoft.Web.WebPages.OAuth assembly and register the twitter client:
OAuthWebSecurity.RegisterTwitterClient(
consumerKey: "blahblahblah",
consumerSecret: "secretblahblah");
Have a look at the MVC4 project template, it's all built-in, all the code you need is there for free in the AccountController.cs file.
Valery.