I didn't sign up to instagram and spotify last weekend because they seemed to want my facebook details.
No, I do not want my music taste and photographs automatically shared with a random selection of friends, strangers, and businesses. There is a slight difference between who I am and who I want other people to think I am.
Oh, I can change them, for sure. And then they can change them without telling me, and share everything anyway.
Imagine my surprise at finding out that youtube was sharing my history. Along with my mostly technical interests, there was fails and a specific interest in philology!