Would there be any way to filter out the default Gravatar avatar? So we don't see this on the forum:
<img src="http://i53.tinypic.com/2im71g7.jpg" border="0" />
<img src="http://i53.tinypic.com/2im71g7.jpg" border="0" />
<img src="http://i53.tinypic.com/2im71g7.jpg" border="0" />
<img src="http://i53.tinypic.com/2im71g7.jpg" border="0" />
Actually they have a few options:
* 404: do not load any image if none is associated with the email hash, instead return an HTTP 404 (File Not Found) response
* mm: (mystery-man) a simple, cartoon-style silhouetted outline of a person (does not vary by email hash)
* identicon: a geometric pattern based on an email hash
* monsterid: a generated 'monster' with different colors, faces, etc
* wavatar: generated faces with differing features and backgrounds
* retro: awesome generated, 8-bit arcade-style pixelated faces
I vote retro. However, I'm not sure, but for some of those the image might have to be generated here at Scirra using GD lib. Which means the image would also be hosted here at the site, and use up some bandwidth.