Since any attempt to censor the material would run counter to the academic ideals of freedom of expression, and would be nearly impossible given the numbers of groups and the even greater numbers of articles in those groups, most academic sites have adopted the convention of not engaging in any attempt to censor the materials. We hope in the future the addition of several gigabytes of disk storage will make that possible. The problem is that the article numbers are generated uniquely on each nntpserver. There are a number of newsreaders to choose from. I am religiously devoted to a few features of nn.
Many users feel the same attachment to tin, or rn, or xrn, or trn, etc.
Since I prefer nn, I will extol its virtues. The general assumption is that you only want to see an article once. NN presents the articles as menus of subject headers. You mark the headers by typing in the letter to their left in the menus. When you have reached the end of the menu for one group, you are presented with the articles one at a time until you have finished the group.