New user creation and add to email?

Right now, it's not super easy. When we release v3.1 (coming soon), it will have a plugin based system for integrating with other systems. Using that, we'll be adding integration to other profile systems and things like importing into newsletter components as time goes on. Additionally, since it's plugin based, we're hoping some other developers of extensions will take the time to add support for JFBConnect import as well.

For now though, if you do import into CB or JomSocial, there are export tools to CSV or other formats that you may be able to use. If it's just email address you want, there are ways to export that information from the main Joomla User table (which is where we store email addresses.. so not sure how necessary 3.1 will be for your purposes. AcyMailer should be able to (I think) import automatically from the Joomla User table, but it may not automatically subscribe the user.

A little rambling, but hopefully this helps. If you have any more questions about possibilities or need more clarification, don't hesitate to ask.