tl;dr：Facebook 認為這個功能是 feature，不是 bug。
在「Why you shouldn’t share links on Facebook」這邊作者發現在 Facebook 上貼的「任何一個連結」都會產生 object id，而任何一個 object id 都可以直接取得 url，無論權限設定，像是這樣：
而 Facebook 認定這是 feature 而非 bug：
可以想像 NSA 之類的單位與地下組織開始狂掃...
Update: Facebook decided to fix this issue after all. This blog post received way more (media) attention than I’d have expected. I am glad people responded and Facebook listened, but if I had known this article would gain this much attention I’d have spent even more time discussing my concerns with the vendor before going public.
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