My subject of choice is AnswerBank. It can be repetitive, it certainly deviates and interrupts but is never boring.
AB has squillions or users, or two, depending on your belief. Some believe the whole of the site is themselves and the Editor in many guises.
It is a place of learning; answers; questions; debate; muppetry; puzzlement; anger; hatred; frustration; laughter; love and the greatest of all online emotions - companionship.
Any time of the day or night a stranger is ready and willing to reply to your post.