Twitter Devs – oAuth Now Mandatory
If you maintain any sort of Twitter application or automatic functionality, you’d better have got sorted out with oAuth, because Twitter have just turned the lever on Basic Authentication…and it’s gone to Off!
Effective immediately, the request limit for Basic Auth has been reduced from 15/hour to 0. You’ve now got to use the newer oAuth method.
The documentation Twitter provides is pretty good. Or, if you don’t want to use that, and you have an open-source, personal project written in VB.NET then someone has already done all the hard work for you and called it TwitterVB.