RSS works at the scale of the individual reader, any other scale is fairly irrelevant. Browser RSS support is fairly irrelevant too; just like there are email c

RSS works at the scale of the individual reader, any other scale is fairly irrelevant. Browser RSS support is fairly irrelevant too; just like there are email clients outside browsers, there are RSS clients outside browsers, and some email clients are also RSS clients. Pingbacks also aren't relevant to usage of RSS by readers.