title: Login form without database and server
body: <p>So I am developing a multi-platform app. I want the user to be able to login and register either via social medias (Facebook API) or with a email and/or phone number login.</p>
  
  <p>So my question is: Is this possible without a database and server? I am using a Windows 8 OS PC with Visual Studio Community as IDE, Universal App as framework and C# as programming language.</p>
  
  <p>Also: Is Universal App the best option for developing multi-platform apps? Or is for example Xamarin a better choice?</p>
  
  <p>Regards,</p>