Slashdot
I've been in a lot of "discussion things" over the years and i've seen them go bad. As they become more well known the worse they get. Initially somewhat-like-minded people are drawn to something for somewhat-similar reasons. When things become popular the noise from people of all walks of life drowns out the signal of like mindedness. In the case of twitter some of the noise Actively tries to ruin the signal.
The initial users of tv, radio and even cars must have felt a similar despair (after the initial thrill of their interest becoming used by more people).
It's not nostalgia, things were better "back then" where "back then" is a point between gaining users and acceptance by the general population.