I will be writing to Facebook asking that they remove this sick video. As Chris points out in his comment above those who abuse animals are very likely to go on to abuse children. In very specific circumstances graphic imagery may be appropriate to highlight the issue of animal cruelty and to stop it happening. For example the RSPCA sometimes uses upsetting pictures to bring animal cruelty to the attention of the general public. However videos of the kind posted on Facebook should be removed and the IP address of the perpetrator handed to the authorities.