You research them, and post answers, comments, corrections to other comments, and so forth. Interesting related topics, and URLs, are also encouraged. Keep a copy of each of your contributions. If you do not know how to do this, then work it out before the final exam. The newsgroup will tend to be particularly vulnerable over the weekends, and it is your responsibility to account for this.
Email address is optional.
In other words we will ask you to repeat, from memory, within reason, information that you have signed, as author, in the news group. Failing this oral exam will raise serious questions about the veracity of your authorship, will result in failure on the exam, and will cause your case to be referred to the dean. We will look for decent coverage of the questions in your responses. In other words, not only must you have made decent contributions to the discussions, you must also have done so with respect to a broad range of, but not all of, the top-level questions I have proposed. Or if you have fewer, but more in-depth answers they will possibly have broad coverage of the topics by themselves.