I've noticed in my last app that it installs with the Activity Privacy set to "Only me" and when the new permissions dialog shows there's no way to change the privacy from there, and this app installs with "Only me" privacy. I wanted to force the Public value for this app privacy and I don't know how to do it.
I show the permissions dialog using PHP:
$params = array(
'scope' => 'email',
'redirect_uri' => 'https://mytabpage'
);
$loginUrl = $facebook->getLoginUrl($params);
See Question&Answers more detail:os