Robert McMillan writes:
We already know that if you use an online social network, you give up a serious slice of your privacy thanks to the omnivorous way companies like Google and Facebook gather your personal data. But new academic research offers a glimpse of what these companies may be learning about people who don’t use their massive web services. And it’s a bit scary.
Because they couldn’t get their hands on data from the likes of Facebook or LinkedIn, the researchers studied publicly available data archived from an older social network, Friendster. They found that if Friendster had used certain state-of-the-art prediction algorithms, it could have divined sensitive information about non-members, including their sexual orientation.
Read more on Wired.