isnt it a private forum because you need to own blockland to register?
No, it's a public forum because anyone can access it and/or buy the game to post on it. It's kind of like asking "is it still public urination if I pee on the ground in Disneyland? You've gotta pay to get in, and it's owned by a private owner, so it's private land!"
It's still considered public.
I don't talk to zapk ever, but he's on my FL.
Maybe you should remove him to lighten up your friends list? What's the point of him being there if you don't talk to him?