You might have noticed profile images (avatars) for commentators on blogs. Whether leaving comments as a representative of a business or personal use, it helps contribute to your online presence.
There is a service called ‘gravatar’ which many wordpress.com users will be familiar with. However gravatar is also used by many non-wordpress based systems also.
To add a ‘gravatar’ image you can either do so via wordpress.com or signup directly at gravatar.com . Importantly set the email address that you use when commenting around the web. Then if gravatar is used by that site it will display your profile image (avatar).
To create a stronger social presence you could use the same image you use at facebook, twitter etc .