Make sure you have good evidence. Post the link/name of the server it happened on and the name of the admin/host that did it.
It takes some really good evidence before any action will be taken. I have to be 95% certain the abuse is real. Screen shots help a lot. I can't just believe the text anyone posts. Your reputation in the community helps me believe you more as well.
If your comment gets deleted it means that we are not taking action because the situation is not severe enough to destroy a server or the situation was too ambiguous or not proven well enough.
Keep in mind very few things will cause action to be taken.