| `email` | string | yes | Public email address of the user |
| `email` | string | yes | Public email address of the user. |
| `size` | integer | no | Single pixel dimension (since images are squares). Only used for avatar lookups at `Gravatar` or at the configured `Libravatar` server |
| `size` | integer | no | Single pixel dimension (since images are squares). Only used for avatar lookups at `Gravatar` or at the configured `Libravatar` server. |