<p>Yes I realised later last night that the i0.wp.com was probably gravatar related, as gravatar is part of wordpress. The long number is just the hash of the email address, precisely so that the email address doesn't have to be revealed to gravatar.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br>Reply to this email directly or <a href="https://github.com/openstreetmap/openstreetmap-website/issues/1032#issuecomment-130563545">view it on GitHub</a>.<img alt="" height="1" src="https://github.com/notifications/beacon/ABWnLZaDJjDe4IQnY6QKFm4tTFh0sY0gks5onD1MgaJpZM4Fqgoa.gif" width="1" /></p>
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