Having an access to FTP (File Transfer Protocol) service means you are a system administrator, therefore liable for criminal charge for any content presented on the website, whether you are the poster or not — according to Article 15 of Computer-related Crime Act. We learned this from Thai Criminal Court, on a ruling of Thantawut Thaweewarodomkul, a web designer of Nor Por Chor USA.
Now be afraid. Web designers who have access to FTP (how can they upload flashy animated GIFs without one?) are now all system administrators. Even anonymous FTP users are now all system administrators. And we all now can go to jail.