I’m currently building a Web Application for TV people to present themselves, be a part of the community and to find jobs online. For that to come true, I need user profiles that are 100% filled up with the information of each user. At first I planned a regular sign up method, but then I decided to add Facebook, Twitter and LinkedIn (just like [coderwall.com)](https://coderwall.com/ “CoderWall”).
Is it smart for me to disable the good old registration via email and just leave the Social Media registration?
As someone without a twitter, facebook or LinkedIn account, it saddens me when websites I use don’t allow me to register. [getkirby.com](http://getkirby.com/ “http://getkirby.com/”) is a perfect example. I would like to be able to participate there, but not so much so that I am willing to register with an entirely different site in order to post.