Mentioned @Mastodon on ProductHunt today as a solution, if you tweet then up-vote Mastodon at the following link... https://www.producthunt.com/ask/1073-what-s-a-good-way-to-share-articles-and-comment-on-them-with-a-group-of-people-in-private .. Platforms spread by sharing them not by the opposite. https://mastodon.social/media/EwyIfgi8llyotbUBYRg