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Ask HN: Share your profitable product?
你提供的链接是一个 Hacker News 的帖子，不是具体的在线工具。请告诉我你想要推荐的**具体工具名称或链接**，我会按照格式为你生成推荐语、分类、标签和评分。例如，你可以说：“推荐这个工具：www.example.com/某个盈利产品目录”。
Can you share with us a product/bussiness you have built that's profitable? and tell us how you marketed it and a link if possible? Comments URL: http…