Hi! I'm stumbled upon the same problem of doublepining, and now I don't clear the lists intentionally. It's works great with lists of pinners, but not very useful with pins. I change the boards from time to time, and repin not only from pinblaster, but from my phone too. When I try to pin something that I already pined, pinterest says "Pssst! Looks like this is already in ...", but pinblaster sad nothing. I figured out, that I can gather pins from my own board to the list, but that's not really helpful, because, no matter than pins in the list, they aren't marked as repined and I can't do anything about it. If I didn't miss any technical problem, the button "mark as repined" would solved a lot of problems! And it would be just insanely helpful if I could sad to pinblaster just do not pin already pinned pins. Thanks!