From Georgetown University Commons Knowledge Base
Georgetown Commons uses a third party service Gravatar  to upload profile avatars to your blog. A gravatar, or globally recognized avatar, is an image linked to your email address which will automatically appear beside your post to any gravatar-enabled site. To sign up, visit http://en.gravatar.com/site/signup. Once you enter your Georgetown email address, the service will send you an activation email. Please note: You must use your Georgetown email address as your Georgetown Commons account and all blogs that are hosted through Georgetown Commons are linked to your Georgetown credentials (NetID and email). By clicking the link in the activation email, you will be prompted to create a username and password to manage your free gravatar account. Once your account is setup, you can then browse for files on your computer's hard drive, upload an image from the internet, take a picture from a webcam on your computer, or select a previously uploaded image. Gravatar allows you to crop your image and assign a rating. When you make your image selection, please keep in mind that this image will be representing you to the Georgetown community and beyond.