The easysocial login page does not collect the new user email. If you have User Registration Type set to "require user activation" this sends the new user an email to verify registration, however no email can be sent since the form does not collect a new user email. If you have Send registration email to admin set to "yes" then the administrator receives an email indicating the first and last name of the new user registering and it shows the email field as blank.
See my stored site access information for details.
Please provide an update so this important new user and administration function works properly.