Is there any way to block friends from talking without hacking?

Hello! You can't block the "talk" item separately. However, if his conversation appears in the friend dynamics in your space, put the mouse on his conversation and there will be one behind.

x

, click it, and the option "Hide this person's message" will appear. If you choose to hide, you won't see his conversation in the future, but not only the conversation, but also the other party's log update. That is, it blocks all his spatial dynamics.