For Prime members, a quick update on logins and commenting. As of today we've enabled the TPM-native Prime login across the site. So you'll be able to comment on the public parts of TPM using your Prime login rather than logging in with a social media (Twitter, Facebook, etc.) or Disqus account. This will streamline things and also allow you to exist under a single 'entity' everywhere on TPM.
Coming later this evening there will also be a 'login' icon at the upper right of the site as well as a place to login in the comments section itself.