The Patroller right can be requested by any trusted user at FarmVille Wiki:Requests for Permissions#Patroller. A full list of current Patrollers can be found at Special:Listusers/patroller. Patrollers are permitted to use {{Userbox/Patroller}} on their userpage, to identify them as such. The template looks like:
Graph IRI | Count |
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http://dbkwik.webdatacommons.org | 7 |