"The Internet creates the illusion that things will always be there, that there are so many people interested in so many things that finding them is just a matter of searching in the right way. You imagine that, with a couple of billion people chattering away every day, everything is being covered all the time, and it’s just a matter of where you want to focus your attention— that you can move in and out of conversations about whatever interest happens to come along. But it doesn’t always work that way, and in one sense, things cease to exist when people stop talking about them."