Amazon added some privacy settings to user accounts a while back. The settings included the option to hide all personal content (reviews, wish lists, questions, etc) from the public pages by default. Once the change was rolled out, many readers who were also avid reviewers noticed that their reviews were missing from the books they had reviewed.
Since Amazon also removes reviews it views as going against the review guidelines, many feared their reviews had been deleted for good. After some digging, it became clear that, while some people had indeed had reviews removed, a good number of the missing reviews were simply due to the change in the privacy settings.
Those settings can be easily turned off to allow reviews to be public once again. If you are also one of those reviewers with sudden missing reviews, you can check your account for the correct settings.
Check the FULL SIZE INFOGRAPHIC for the steps to correct the problem.