Is there any data on how many actual potential donors did a sample as a result of this campaign? The 7000+ reblogs is a very impressive number - but I'd bet nowhere near all 7000 went through the process. Would those 7000 reblogs even result in 7000 potential donors?

It could provide an interesting perspective on this hot topic of 'painless activism'. While getting tested is pretty easy, there are still plenty of points of process attrition for those to drop out (or not get started).