@Sophie: Amazon seem to be reviewing posters of reviews at the moment.
If you or your account contravene Amazon review polices then yes you will probably find all of your reviews wiped and your ability to leave reviews terminated.
Contact the Amazon Help team to find out what you have done wrong and/or seek to recover review privileges.
NOTE: The ability to post reviews on the Amazon website is a privilege and Amazon may withdraw that privilege at any time for any or no reason, in accordance with the Terms and Conditions of service of your Amazon Account.
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I wonder why someone would follow their own alternative forum profile.