Tag Archives: location

Facebook 大量蒐集 GPS 定位資訊後用機械學習「猜測」你可能認識的人

Bruce Schneier 這邊看到「Facebook Using Physical Location to Suggest Friends」這則文章,引用自「Facebook is using your phone’s location to suggest new friends—which could be a privacy disaster」這篇報導,報導開頭寫著更新的資訊:

Update (June 28): After twice confirming it used location to suggest new friends, Facebook now says it doesn’t currently use “location data, such as device location and location information you add to your profile, to suggest people you may know.” The company says it ran a brief test using location last year. New story here.

Facebook 第二次確認後發現是標準的「啊!靠腰!是 PR 災難」的處理方式。在第一次跟 Facebook 確認時,Facebook 發言人的正式回覆說明了手機的位置是計算的條件之一:

“People You May Know are people on Facebook that you might know,” a Facebook spokesperson said. “We show you people based on mutual friends, work and education information, networks you’re part of, contacts you’ve imported and many other factors.”

One of those factors is smartphone location. A Facebook spokesperson said though that shared location alone would not result in a friend suggestion, saying that the two parents must have had something else in common, such as overlapping networks.

“Location information by itself doesn’t indicate that two people might be friends,” said the Facebook spokesperson. “That’s why location is only one of the factors we use to suggest people you may know.”

靠背...

Facebook 更新 iOS 應用程式,修正吃電問題

在「在 iOS 上不使用 Facebook App 時要完全砍掉 process」這邊提到了 Facebook 在 iOS 版的應用程式會在背景播放無聲音樂,導致吃電特別兇的問題,Facebook 的 Ari Grant 出來澄清是 bug 造成的,而非故意行為。

修正了兩個 bug,第一個是 network code 的部分:

The first issue we found was a “CPU spin” in our network code. A CPU spin is like a child in a car asking, “Are we there yet? Are we there yet? Are we there yet?”with the question not resulting in any progress to reaching the destination. This repeated processing causes our app to use more battery than intended. The version released today has some improvements that should start making this better.

第二個則是之前提到無聲 audio 的問題:

The second issue is with how we manage audio sessions. If you leave the Facebook app after watching a video, the audio session sometimes stays open as if the app was playing audio silently. This is similar to when you close a music app and want to keep listening to the music while you do other things, except in this case it was unintentional and nothing kept playing. The app isn't actually doing anything while awake in the background, but it does use more battery simply by being awake. Our fixes will solve this audio issue and remove background audio completely.

同時澄清並沒有要在背景更新取得地理位置資訊:

The issues we have found are not caused by the optional Location History feature in the Facebook app or anything related to location. If you haven't opted into this feature by setting Location Access to Always and enabling Location History inside the app, then we aren't accessing your device's location in the background. The issues described above don't change this at all.

理論上新版應該會省一點電了?

HTTP Header 裡的 Location 使用相對路徑...

HTTP Response Header 的 Location (俗稱「轉址」) 被用在不少地方,剛好今天被 ccn 戳到相關的問題...

在維基百科的「HTTP location」條目裡面有說明 HTTP/1.1 的規範裡要求必須是 absolute URI:

Location       = "Location" ":" absoluteURI

但實務上,目前市場上常見的瀏覽器都支援相對路徑。而且在 HTTP/1.1 修正版 (目前還在 draft) 裡被修正成:

Location = URI-reference

並且說明 relative 時的判定方式:

The field value consists of a single URI-reference. When it has theform of a relative reference ([RFC3986], Section 4.2), the final value is computed by resolving it against the effective request URI ([RFC3986], Section 5).

所以就大膽用吧...

Mozilla 推出的定位服務...

Mozilla 推出定位服務:「Introducing the Mozilla Location Service」,也就是 Mozilla Location Service

行動裝置利用收到的 WiFi 以及基地台訊號資訊定位的服務。這也是 GPS 定位以外最常被用到的方法 (尤其是室內與地下)。

維基百科的「Cell ID」這個條目可以看到很多類似的服務,可以看到兩個比較大的:

不過 Mozilla 的名號使得 Mozilla 推出的這個服務成長的相當迅速:

可以看出來 Mozilla 一宣佈後才一個多禮拜就直接 double,不知道要到什麼程度才會趨緩...

目前雖然比起其他的服務還差了一大截,不過有希望在半年一年內成為權威的 Location Service...