Bug974867 correspondence of reviews

https://bugzilla.mozilla.org/show_bug.cgi?id=997547
The case with both email and number seems not possible for now, but I just wondering why we don't sync the new activity type with email, and user could choose the apps which could support email address via option menu. We don't have to create additional button in contact, message app could know exactly which type it need to deal with(websms or mail), and 3rd party developers won't get confused while opening an activity via email(our email and message apps should support email address, but opening a mail activity only opens email).

Back to the original question, I would prefer we check the activity type here. If the type is webmms and email exist, we use email, otherwise we choose number.