How can I find out additional details about someone in a conversation with me?

If you click on the picture of a person in a conversation stream, you will see a popup showing additional details about that person including their email address, time zone, phone number (Kona Business only), title (Kona Business only), department (Kona Business only), location (Kona Business only), and skills/expertise (Kona Business only).  You will only see information that was entered by the user in their profile.