Well, if you read the terms and conditions, you grant them a transferable license to use your content in anyway they see fit.
"PICFARI does not claim ownership of any Content that you post on or through the Service. Instead, you hereby grant to PICFARI a non-exclusive, fully paid and royalty- free, transferable, sub-licensable, worldwide license to use the Content that you post on or through the Service, subject to the PICFARI Privacy Policy."
NOT!
Frank