There are signs when these civilizations come to an end
Given that the population of the United States is more than 300 million...that's still a pathetic sample size when you do the math. 150,000 people is only 0.05% of the population. That's far less than pretty much all of the commonly used statistical margins of error. And even if you factor in just the Twitter users, not the entire American population, that sample size is still only 0.7% of the overall Twitter-using American population.