Give them a free ebook and host it on a landing page where they have to enter the email to download the file and also create a forum page on your website, asks your visitors what questions they might have about your business, and collects email addresses to follow up with them.
Kevin Church/BBC News
。业内人士推荐快连下载安装作为进阶阅读
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// 每轮将最大值"冒泡"到末尾，所以范围逐渐缩小