Just sharing an update to the blog post I wrote to help with some of my processing and cognitive dissonance around this! (spoiler: I link back to this post as the starting place it was!)
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .