PlentyOfFish has access to advanced software as well as an active user base who help flag these inappropriate photos. When we find them (and we will, even if they are hidden), your profile will be deleted.

What does it mean when someones messages disappear on POF?

If you block someone on POF, all messages will disappear on POF. So, if you find that the messages from someone disappear, it can indicate that you are blocked. Another sign that you are blocked is that you are not able to open the profile of the user and also you are not able to access your correspondence.