READY OR NOT ? shows how people could use your social-media posts to find you in the physical world. It uses GPS data attached to Twitter and Instagram posts to create a map of where someone's been posting from recently. Try to find yourself, your friends, or your favorite celebrity! Where are you most likely to be at 2:00 on a Tuesday?
In my case it only showed the location where I logged in to Foursquare. But it's a good idea anyway to have a look at teachingprivacy.com. This one I found particularly interesting:
The number of Internet-connected devices, services, and applications, and the sheer volume of information on the Internet, are growing daily. At the same time, government and industry are opening more data to the public, including information that used to only be available offline. Paper-based records are being scanned and made searchable through optical character recognition (OCR). People are regularly sharing more from their daily lives, and digitizing physical media such as old photos and videos. Governments are still refining regulations about what data can be made available and how, and the social-media industry is constantly tinkering with its privacy policies.
Data users (governments, businesses, and individuals) always want better retrieval and search capability. As a result, academia and industry are providing “deeper” searching of more types of data, including semantic searching of text and multimedia retrieval techniques that can find images and videos by features of their content.