Four rules, and a federal agency that does not routinely moderate

Some CDC sites, social media profiles, blogs and applications allow public
comments. Comments are encouraged and welcome, and the agency says it will
try to answer questions in a timely manner while noting it may not respond to
every one.

What is prohibited

• Personally identifiable information — Social Security numbers, home or
  business addresses, email addresses, phone numbers
• Threats of harm or violence towards individuals or groups, including
  HHS and CDC staff, or towards personal property
• Profanity, nudity, obscenity or vulgarity, including images of or links
  to such material
• Explicit promotion of commercial products or services

The first item is unusual in a comment policy and it is the most
public-health-specific of the four: people post about their own health, and
a comment naming an address or a phone number exposes the person who wrote it.

The honest bit

**We do not routinely moderate posted comments, though we reserve the right
to hide or remove comments in violation of this comment policy.**

Not "all comments are reviewed". A policy that claims routine moderation and
does not deliver it misleads people about how safe a space is; one that says
it will act on violations when it sees them is accurate, and tells a reader
what to expect.

This policy applies to all discussions on any CDC-managed forum.

And the standing disclaimer: **the opinions expressed in public comments are
those of the authors and do not represent the official positions of the CDC or
the Department of Health and Human Services** — which is worth knowing before
treating a comment under a CDC post as anything other than a member of the
public speaking.

Source: Centers for Disease Control and Prevention.