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They know your location and proximity to other facebook users.

• soared 10y ago
  This is the actual answer. Your phone tried to connect to their wifi and knows they've also connected to that same wifi. With few other quality friend suggestions, these ones popped up.
  • rl3 10y ago
    Or, if one or both parties were running the Facebook app with location services enabled, it could also have been GPS too. I wrote about this a few days ago.[0] Basically, new Facebook accounts that you run on the app with location services enabled will provide creepy location-based friend suggestions by default. [0] https://news.ycombinator.com/item?id=13252568 https://news.ycombinator.com/item?id=13252568
  • kminehart 10y ago
    This is fairly old but if you're curious I have since gotten a new phone and have not connected to their wifi; it was likely their contacts that were uploaded to Facebook which included my number.