Good Day stonecrop.
Thank you for your message. You can only rate a member once however what would count towards thats member Rating would be the last vote you gave that user. For example if you rated any user on Wednesday with a "4" and today you gave that member a "5", the "5" star rating would be your vote for that person. The "4" rating would automatically be deleted.
You can use green thumbs to recommend one members post. Please note you can only recommend one post one time.
Thanks again for your inquiry and your contributions to the AGORACOM community.
Regards,
AGORACOM