Facebook collects data of non-users of its social network via dozens of mainstream Android apps that send tracking and personal information back to the social network. Some of the dozens of apps sharing data with Facebook include Kayak, Yelp and Shazam. Facebook said developers were responsible for configuring the apps to share or not share data. Privacy International examined 34 Android apps, each with an install base from 10 to 500 million, and found they transmitted data through the Facebook Software Development Kit (SDK)
Source: https://threatpost.com/how-facebooks-tracks-non-users-via-android-apps/140436/