Buying/automating Facebook comments on comment box?

I need FB comments posted on a FB comment box for a video on a webpage. I need the comments to be geared towards agreeing with the video content/marketing. I can provide examples of the content. Can someone recommend a tool or service that can post comments from different accounts?

You can try here: http://www.blackhatworld.com/blackhat-seo/f200-social-media/ . Maybe you will find what you need.