[daveslash]

"Another way of doing it is by sharing polarising, unconventional ideas you have. These ideas will repulse those that are close minded towards your ideas and attract more people like you."

This is absolutely true, regardless of the medium - but the internet allows you to do this at scale. If you have an unconventional idea, it makes sense to try to seek out the few like minded people with whom you can discuss. However, in today's world I would be very cautious of encouraging anyone of building their own echo chamber. It's one thing to go against the grain and seek out like mindedness; it's another to live in an echo chamber.