最近 Facebook 再度更新了它的 Promotion Guideline 中關於 Social Plugins 及 "讚" 的應用，原文如下：
You must not incentivize people to use social plugins or to like a Page. This includes offering rewards, or gating apps or app content based on whether or not a person has liked a Page. It remains acceptable to incentivize people to login to your app, checkin at a place or enter a promotion on your app's Page. To ensure quality connections and help businesses reach the people who matter to them, we want people to like Pages because they want to connect and hear from the business, not because of artificial incentives. We believe this update will benefit people and advertisers alike.
要解釋這件事情，我們要來回顧一下這幾年， Facebook 對於相關事宜的限制及調整，其實我們已經在過去重大更新時就有同步發文解說，我們用一張圖來了解演進過程：