The KSduino website and this forum use Gravatar to show users avatar.
Your Gravatar is an image that follows you from site to site appearing beside your name when you do things like comment or post on a blog. Avatars help identify your posts on blogs and web forums, so why not on any site?
Gravatars are globally recognised avatars. Basically, you upload your avatar to the Gravatar
site, and it will automatically appear on all blogs and forums that support Gravatar. Whenever you change your avatar, it will automatically change on all Gravatar-enabled sites. Gravatars associated with the users email addresses.To setup and manage your gravatar fall back to: http://gravatar.com