NetBuilders itself is required to operate by the laws of the country in which it is hosted.
The material here is to follow those laws. If NB is hosted in, say, the US, then the material on this site is to abide by US law. Whereas if it was hosted in say, Singapore, then the material on the site is to abide by Singapore law. You, however, as an individual, are bound by your own laws and international laws, as well.
Let's say that NB is hosted in the US. You live in Canada. You have to follow laws that apply to you - which would be United Nations regulations, International Agreements that involve your country, and Canadian law. You are also subject to US law. But, Will and the NB Staff don't need to allow you to exercise any rights or freedoms, such as the freedom of speech. You don't have that right on a forum. Anyway, let's say NB is hosted in a country where child pornography is LEGAL. If you post it, you don't violate their laws, but you violate the laws of your country. Therefore, you need to always follow your applicable laws, and be aware of those in the country which hosts the site because they may apply to you in certain situations as well. But now, for Will - he needs to know his laws, and the laws where the site is hosted, to a higher extent.
For example, here is a part of my Terms of Service on my forum:
So, to summarize - when it comes to what's illegal/legal here:7.Governing Jurisdiction of the Courts of California
8.Compliance with Laws.
Member assumes all knowledge of applicable law and is responsible for compliance with any such laws. Member may not use the Service in any way that violates applicable state, federal, or international laws, regulations or other government requirements. Member further agrees not to transmit any material that encourages conduct that could constitute a criminal offense, give rise to civil liability or otherwise violate any applicable local, state, national, or international law or regulation.
Whatever is illegal in the United States is illegal here.
Whatever is illegal in your country is illegal for you to do here. Both of these apply.