Later, the CEO was questioned about a document that graphed the proportion of 11 and 12-year-olds who were monthly active users on Instagram. The chart indicated that at the time, around 20 percent of 11-year-olds were monthly users of the service. "I agree that the graph says that, I am not familiar with what methodology we were using to estimate this," Zuckerberg said. "I assume that if we had direct knowledge that any given person was under the age of 13, that we would have them removed from our services."
In the US, there is no industry-standard, 100% objective scale for mattress firmness. How firm or soft something feels ultimately depends on factors like your body type and sleeping position. Brands will also sometimes use words like “plush” to describe softness, for example, or “luxury firm” to describe a mattress that’s somewhere between soft and firm.，更多细节参见PDF资料
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On Elephants in the Room: Trusted Execution Environments，详情可参考纸飞机官网