Quoted from robin:Drain topic
On the forum front page, you will now see an X icon when holding your mouse over a topic title. Click the X icon to drain that topic. Draining a topic essentially removes it from your view, it will no longer show up on Pinside.
PM ignored users
You can now no longer PM users who are ignoring you. You will see a generic "user not reachable by PinsideMail" message.
I believe it is time to make some better combinations of these features. For example, we need the "drain user" feature which when utilized, would eliminate them from Pinside altogether. If enough people put you on drain, your position on Earth is subsequently eliminated. Robin?