Publish web news directly into facebook and twitter

The main project is created on MVC, C#. Need some help to create the code that gets part of the news that we post in our web and create a facebook stream in our wall and also creates a twitt into our twitter account. The idea is to get the 3 or 4 lines of the web posted new, and publish it on our facebook and twitter, this 3 or 4 lines will finish with a link to the posted new in our web. With this code the finel user will only have to write the new one time and it will be published into 3 different places, the web, facebook and twitter.