About 30% of apps in the Google Play Store contact Facebook at startup & the tools FB provides to developers often transmit personal info, like user-specific Advertiser IDs.
Most developers asked didn't realize this wasn't anonymous, reports @cwarzel. https://www.buzzfeednews.com/article/charliewarzel/apps-are-revealing-your-private-information-to-facebook-and
Original tweet: https://twitter.com/DuckDuckGo/status/1079388387000418305
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