"We chose a threshold that requires a few searches within a short period of time, while still erring on the side of caution," Instagram's blog post explains. "While that means we may sometimes notify parents when there may not be real cause for concern, we feel — and experts agree — that this is the right starting point, and we’ll continue to monitor and listen to feedback to make sure we’re in the right place."
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第四十六条 网络安全产品、服务提供者应当采取下列措施，防范其产品、服务被用于实施违法犯罪活动：，详情可参考服务器推荐
self.seen_urls = set()。关于这个话题，同城约会提供了深入分析