A minecraft mod which adds twitter functionality in the form of a block.
TweetBlock is licensed under the MIT license, the basic gist of this license is: do whatever you want, just don't hold me liable.
For the Twitter API code, I use the Twitter4J Java library. It's licensed under the Apache 2.0 license.
More details on the licenses can be found in the LICENSE file.
The Java code relies on Twitter4J to communicate with the Twitter API, the library can be downloaded at twitter4j-3.0.5.zip. After downloading the file, add twitter4j-core-3.0.5.jar to the project build path.