I don't post the tumblr sites because I worry that they will take them down once they start getting broader attention beyond the Tumblr community. I also try not to post vids of people immediately, and just save them for distribution later. Once the vids are out on tumblr, I figure they're fair game for all to see, but I don't want to prevent the ladies from getting second thoughts about posting more.
That said, based on what anyone posts here, there are usually ways of finding them. PM me if you can't find them through normal means.