In Oklahoma we post all alerts on Facebook and Twitter.
We allow comments. We discussed turning them off but we have been regularly getting tips in the comment sections.
We provide a link in the WEA to our Twitter page for Amber, Blue and EMA messages.
The Oklahoma Highway Patrol houses the alert program, but we are not a primary investigative agency for most missing person. (We have some jurisdiction on turnpikes). We are not required to seal any investigations.
We delete the post a couple days after the subject is located. We pay a company to backup all of our social media to meet open records requirements.