One of the fundamental differences between Facebook and Path is that Path is designed around privacy, Facebook isn’t. On Facebook you have to really work to retain some degree of privacy. You have to set up your sharing preferences carefully, decide whether search engines should be able to index your profile and who can re-share your stuff, tag you and more.
In Path, you can, at best, see that a person is a Path user, how long that person has been using Path and how many moments that person has shared. That is, unless that person hasn’t deselected the option that limits discoverability to friends. If the Path user does that, you can’t even find the person by searching for her.
If you only want to share your moments with your friends and family and not with Facebook and its advertisers, try Path out. You can always set Path up to publish to Facebook too. What is the worst that can happen? Advertisers won’t be happy with you?