Earlier this week I wrote that privacy shouldn't be an option. Privacy - like security - should be expected, not something that users have to enable.
Need proof? Just read about Girls Around Me, an incredibly ill-conceived app that takes advantage of women who don't know they need to configure the privacy settings in the social software they use.
Software that isn't private by default assumes users know how to make it private, which is an unrealistic - and, in the case of "Girls Around Me," potentially dangerous - assumption.
I write the Android version of Glassboard, an app designed for private conversations. Find out more at glassboard.com.