Dive summary:

• Facebook changed its data use policy to allow information to be shared with affiliates later this month, and the change will likely lead to serve ads on Instagram.
• Facebook could use data made available by its users to take Instagram snaps to customize a user’s experience on its web or mobile apps.
• Google, Microsoft and eBay/PayPal already have similar policies to allow information sharing with affiliates.

From the article:

… But the point remains that we are increasingly allowing personal data to be used in ways that are not obviously related to the action we initially took in order to generate that data. To an ordinary Instagram user, it is not obvious that using the Instagram app will have any impact at all on their Facebook experience. When we think about data privacy, we normally think about a company giving or selling our information to someone else. But a single company using our information in ways that we did not anticipate raises privacy concerns that are just as significant. …