Tipping point

In unit 4 I've learned that Tipping point is when a small change or incident become significant enough to cause a large, more important change.

Is that magic moment when an idea, trend, or social behavior spread everywhere like wildfire. I mean, the topic of the moment that is through word-of-mouth everybody.

One of the things that have been said to be about to reach a tipping point is society's willingness to tolerate gay marriage.