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I was the PM for this at Twitter. You pretty much nailed it. The straight Address Book algorithms are Reverse Address Book (your #1) and Strong-ties prediction
by prlambert 9y ago
I was the PM for this at Twitter. You pretty much nailed it. The straight Address Book algorithms are Reverse Address Book (your #1) and Strong-ties prediction (your #2 and #3).
LinkedIn for sure also uses common groups (schools, workplaces, interests, etc), and geolocation in their recos. There's also sneakier signals like app graph and browsing history, though in my experience those were more useful for content recos than people recos.
- oridecon 9y agoDo big companies buy 3rd party databases that they can cross link data or is it easier to build your own with linkedin patterns?
- prlambert 9y agoThey would if they could and it was clean/legal. But there are very few purchasable databases that make a dent at Twitter or LinkedIn scale. This line of thinking was behind the original motivation for Digits (part of the Fabric SDK). Get developers to collect Address Books for us, in return they get a free SMS-based verification service.