Social network graphs are also a huge surveillance leak. If you use an otherwise anonymous way to talk to all your friends, and someone knows who those friends

Social network graphs are also a huge surveillance leak. If you use an otherwise anonymous way to talk to all your friends, and someone knows who those friends are, they have a pretty good idea who owns that "anonymous" communication channel. This is tragic, since the most interesting and private uses of the internet are in interacting with friends, family, and loved ones.