Facebook 新功能：你的前 7 位好友
Facebook’s new feature: your top 7 friends
Facebook 上线“前 7 位好友”功能，让用户标记更新对自己特别重要的好友，界面类似 Google Circles。该功能用机器学习与用户信号提升信息流相关性，应对 EdgeRank 等算法陷入局部最优、信息流内容固化的难题。这可能意味着 Facebook 在寻找新的好友亲密度强信号，或围绕前 7 位好友列表构建新功能。
In short : Facebook introduces a top 7 friends feature to enhance feed relevance using machine learning and user signals.
Facebook is asking me to redefine my closest 7 friends.
I logged into Facebook today to see this new feature, starring your friends. Below this text is a Google circles like UI that asks me to star friends whose updates are particularly important to me.
With hundreds of friends, the average Facebook user logs in to see wall of updates that aren’t quite relevant. Some of us have reduced our friend graphs and unfriended contacts in order to return the feed to relevance, which isn’t a desired user behavior. Facebook, after all, wants to encourage expansive graphs.
The challenge that feeds everywhere face is the local minimum problem. Machine learning algorithms like EdgeRank can easily fall into local minimums, where the same people appear on the feed because they’ve been appearing on the feed. The people in the feed become stale and either the model has to be rebuilt or a strong signal must be injected into the algorithm to change results.
This beta feature might indicate Facebook is looking for another strong signal of friend-closeness, to recenter the feed on the people a user most cares about and return relevance to the feed.
Or it might indicate a push to build new features around a top 7 friend list.
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来源：Tomer Tunguz 博客（VC 分析） · tomtunguz.com