Ask HN: Idea of building a Pay per Click system1 ポイント·投稿者 kingdm·14 年前·2 コメントOut of curiousity, how does this pay-per-click works? Any idea on how they built that kind of system?1 コメントコメントを投稿[–]mooism2·14 年前返信Which pay per click system? Who is "they"?[–]kingdm·14 年前返信Google Adwords perhaps?