If you’re developing an application that needs to use Twitter, you’ll most likely have to authenticate in order to post tweets. If you’re using C#, you can use TweetSharp. However, I found it doesn’t really work for Windows Phone, in particular because the GetRequestToken method is missing. This is not to say the work Daniel Crenna is bad, far from it. But for a Windows Phone app I’m developing I needed to authenticate with Twitter. And finally, TweetSharp is no