1. Cookies are only one of many data points for identifying user. A properly unidentifiable browser is tricky to implement.

2. Depending on your settings, an agent faker can make you move identifiable should it project a unique or impossible agent. Even one set on to a randomized list can be telling as so few people use such settings. You have to be careful.

3. And who is going to read these emails without subject lines?

4. Unless you are going to live in a unibomber-style shack, you need some form of public network. And any successful private network eventually expands to the point of being public. Even facebook was once private.

5. To keep informed you'll need to read and communicate online ... which only makes 1-4 more difficult.