Salting the hash per web application would allow user to see which individual applications are using his avatar photos, and possibly give him control over which of his avatar photo he wants to show in which web application, while still using the same email address in all web applications.
Salting the hash per web application would allow user to see which individual applications are using his avatar photos, and possibly give him control over which of his avatar photo he wants to show in which web application, while still using the same email address in all web applications.