So, SecureMyEmail will generate real and valid PGP keys that I can use for other PGP functions, like Facebook, and other sites and contacts already using PGP?

Yes. You can use your SecureMyEmail public PGP key to encrypt communications from Facebook, and other PGP-enabled websites, as well as share them with folks who use regular PGP. For people, you can just invite them through the app, and they can either join SecureMyEmail, or exchange their PGP keys with you through a secure mechanism we built.