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https://blog.stackoverflow.com/2013/09/five-years-ago-stack-overflow-launched-then-a-miracle-occurred/

Some people were able to upload pictures and I was wondering how to do that? I see no way of logging in and the only available way to post is to leave a comment at the bottom with Name, Email, and Website.

At first I thought you had to have a website and it crawls your website for an icon but some people without links to a website have a profile icon.

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    Those icons are Gravatars. gravatar.com. Some people don't have a Gravatar.
    – user102937
    Commented Sep 17, 2013 at 21:02

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Looks like the blog uses Gravatar to populate the image of the user based on their email address assuming they provide one.

Also, the Stack Exchange network of sites also can use Gravatar image as your profile image on all of the sites if you want to do that.

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