I'm not a lawyer either but it's an interesting subject. In England, for a simple contract to exist you need offer, acceptance, consideration. What do you have that you are offering me that I might accept and what do I get in exchange for abiding by your terms? What thing of value changes hands between us that could be the 'consideration'? Also I just realised you didn't state the jurisdiction you will enforce your contract, so I choose... Somalia. You say 'I'll see you in court' I say 'I'll see you in Mogadishu then' :-)
> What thing of value changes hands between us that could be the 'consideration'?
By HN standards, I am obviously a high-net-worth individual with a total karma count of 2619. Interacting with me, a Public figure in the context of our community, is a privilege given that I can't interact with an arbitrary amount of users in a given window of time. Since I am offering you this interaction free of monetary charge, the terms of interaction can be considered a reasonable way to protect my interests, productivity and daily life as a high-net-worth individual user of the site https://news.ycombinator.com.