I used to use bought domains and they kept getting banned within a month. Before you say it I never touch group boards, and only post about 20 pins through the day. It was getting expensive buying domains all the time before they even made money back. I figured that tumblr might be better since there must be alot of genuine users who use it as well. Well pinterest fucking hated that url even more and was itching to go on another banning spree on my accounts yesterday before I quickly stopped all activity.