(5/?) 
What are the downsides of #PGP?

1. It encrypts your data in transit, but it does NOTHING to hide your (for our purposes, pseudonymous) identity, and passive observers, if they have access to the encrypted data, can tell who is talking to who, and when, even if they can't read what's inside the messages. It doesn't hide your "social graph"!
2. (crypto nerd thing) If someone steals your key, they can decrypt all old messages. Newer systems can prevent this from happening, but PGP is kind of a lowest common denominator for exchanging private stuff.

These posts will get interesting again soon, I hope. Just trying to make people understand. And again, we are doing this for FUN, with PSEUDONYMOUS IDENTITIES.