Possible, but frowned upon, as in the TOS at the top of the page.
The Forum is divided into a number of topical areas. Please post in the appropriate area for your topic and do not cross post between topics; i.e., do not post the same message in two or three different topical areas. If you post in one topical area, don't post a message on the order of "Look what I posted in the other area" in a different topical area.
If you put: "Attention 2 and 3 railers" or the like in your title, it will end up on the right. The issue might be how long it stays there. It would get popped to the top with every additional post, but stuff moves on fairly quickly around here!
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 .