本文逐一拆解a16z这三份报告的核心判断，以及这些判断背后，钱正在往哪里流。
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Dr. John Ackerman, an expert on youth suicide prevention who was not involved in Instagram's alert feature, told Mashable that it appeared to be carefully considered. Instagram said it relied on feedback from a group of experts it assembled on suicide and self-harm. (Instagram does not publicize the members of its advisory group.)