Gravatar is a service where the users can create an account based on their email address and upload an Avatar associated with the account. Gravatar is integrated with most of the blogging websites (Tutebox is one of the websites which uses Gravatar as the profile picture).
Basically when the users post their comments on such blogs that require an e-mail address, the blogging software will check whether that email address has an associated avatar at Gravatar. And if so that Gravatar is shown along with the comment.
A Gravatar avatar can be up to 512 pixels wide, and it is always square shaped and is displayed at 80 by 80 pixels by default. In case if the uploaded avatar is larger or smaller, the avatar is scaled to fit in the size. Each Gravatar is rated with an MPAA-style age recommendation, which allows webmasters to control the content of the Gravatar displayed on their website.
Under one email address you can have different avatars based on following categories, and they are picked according to the type of website you have logged into.
To eliminate spam, e-mail addresses are encrypted with the MD5 cryptographic hash function. And this prevents spambots from harvesting e-mail addresses.
Visit http://www.gravatar.com/ and customize your Gravatar now.
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