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Find apps. youre going to click on apps, here at the top you see logged with feign, airbnb, 31 others. those are other apps im sharing my account with. >> youre given permission to do that. >> reporter: right. so airbnb they see my name, friend li, likes, they see that i like the beat with re medical burr. im not sure why. >> nbc live with halle jackson. whatever. >> reporter: that type of information can be used by those third-party apps and that is where that targeted advertisements come in an...