- Report or try to contact TUMBLER. - report to the police department. Make sure you give them the URL Link to that page that you saw. You'll need evidence such as an image or a video proving that they did it to the poor cat.
Usually..... the police can track the uploader or whom ever wrote that's COMPUTER IP ADDRESS or INTERNET IP ADDRESS.
I feel bad for the cat. I wish I can held it up and take out the needles and take it to the vet... urgh.. how can they do such thing.
You cannot do anything. Him/her saying that does not mean its true, I even bet most of those are fake. You cannot even get a warrant to search his/hers property, if the police EVEN decide to take it seriously and trace the computer id/ address. Also it is not animal cruelty unless it actually happened. Its like saying 'im going to kill you'. I bet you said that countless times and did not mean it once.