A newsgroup is not live.
People add their comments to a newsgroup over time, as they find and read others' postings.
Be very cautious about posting your resume in a newsgroup, even a newsgroup specifically for that purpose. When it comes to posting your resume in a newsgroup, the common sense that you use every day applies to the Internet as well. Should your resume be posted in a newsgroup, they may see it. Yes, you will, as a consequence, be somewhat more difficult to reach. Any minor delay or inconvenience will be offset by protecting your privacy.