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by DjangoReinhardt 3417 days ago
Two potential causes:

1. Location matching - both your apps detected you in the same place for an extended period of time. Maybe you guys had mutual friends in the music community?

2. Microphone[0]. They have since refuted that claim[1], but I've had way too many coincidences and I'm choosing to keep my tin-foil hat on... :/

[0] www.geek.com/apps/facebook-app-now-listens-and-records-audio-when-you-post-updates-from-your-phone-1595873/

[1]http://newsroom.fb.com/news/h/facebook-does-not-use-your-pho...