Yes it is possible to set profile picture size in Facebook login. Use width(value).height(value) after picture. Follow this example code
// Get user facebook profile details
$fbUserProfile = $this->facebook->request('get', '/me?fields=id,first_name,last_name,email,link,gender,locale,cover,picture.width(400).height(400)');
I hope it will be help full for you. If any problem ask here.
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