fb massage app的幾分鐘前上線
fb massage 手機版點進去和朋友的聊天視窗，上面會顯示幾分鍾或幾小時前上線，
請問這是指對方手機連到網路時間？點開fb app時間？還是點開massage app時間之類的？
有種被監控的感覺xd
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