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If you use a location sharing app from Google (Google Maps introduced location sharing a while ago) or Facebook (location sharing features are part of Facebook Messenger and WhatsApp) get ready to be tightly followed. Google and Facebook are probably the two biggest digital ad agencies in the world (both companies receive a huge chunk of their profit from ads) and you can be assured they will use your location data to serve you better ads. Snapchat will be doing even more.