Path Uploads Your iPhone Address Book To Its Servers

What do you mean this app uploads my entire address book to its servers without my permission? Is that a feature or am I just holding it wrong?
I’m not insinuating that Path is doing something nefarious with my address book but I feel quite violated that my address book is being held remotely on a third-party service. I love Path as an iOS app and I think there are some brilliant people working on it, but this seems a little creepy. I wonder how many other iOS apps actually do the same.