Are you allowed to place a "Facebook-like-button" on a porn site?

[Your Shadow]

Read Facebook's Terms of Use before you try it. They do not allow porn links on their pages so the reverse is probably true.

FB's Terms: https://www.facebook.com/#!/terms.php

3. 7. "You will not post content that: is hateful, threatening, or pornographic; incites violence; or contains nudity or graphic or gratuitous violence."

Special Provisions Applicable to Share Links

If you include our Share Link button on your website, the following additional terms apply to you:

1. We give you permission to use Facebook's Share Link button so that users can post links or content from your website on Facebook.
2. You give us permission to use and allow others to use such links and content on Facebook.
3. You will not place a Share Link button on any page containing content that would violate this Statement if posted on Facebook.

Ron