I'm as bored by micro-updates about FB's share price as the next person, but consider two propositions: 1. Drastic drops aren't the only interesting ones. If F

I'm as bored by micro-updates about FB's share price as the next person, but consider two propositions: 1. Drastic drops aren't the only interesting ones. If FB were to decline slowly all the way to (say) zero, presumably the decline would have become interesting and newsworthy sometime before that point regardless of the slope of the decline. Where exactly is this point? Who knows. But given the human mind's heightened interest in multiples of 10, $20 seems like as good a candidate as any other. (Along with probably $10 and $5.) 2. Whether you believe in them or not, stock prices are said to have psychological support levels. Above price X, the investing public is inclined to view a stock favorably. But if it drops below that, a new narrative may begin to emerge that itself can have an effect on the price. You call this "nonsense" but provide no evidence in opposition to the conventional wisdom. It may be that "objectively" there is nothing special about the number 20, but markets are made by interactions between people and in modeling the behavior of people, psychological facts are relevant. One psychological fact is that people take an interest in multiples of 10, and movement across them can therefore have significant consequences.