Oh dear god, they're building.... a marketing profile! The horror, the horror. Won't somebody think of the children?
Now Path knows that I'm friends with Tom, and Tom likes Starbucks, therefore I must like Starbucks. Initiate media buys NOW!
Does anybody want access to my address book? Just let me know, I'll send it to you in a CSV. Prepare to be underwhelmed.
When someone else decides what to do with it without bothering to ask for permission, it is called an "invasion of privacy." For many people this is a bad thing. Bad enough that there are very severe legal repercussions for it dependent upon the jurisdiction and severity.
I am getting really tired of the argument that the facebook lot are being "brave" on my behalf. Or that "privacy is dead" like it was a fad to be discarded when the taste went sour.
Privacy is a right and it is to be abrogated with explicit consent only. While it is a right that is often abrogated by the actions of its possessor (wittingly or no), that is their option and choice. It is not for anyone else to decide.