dstiles - 7:49 pm on Jul 4, 2013 (gmt 0)
I found approx 90 blocks on it during the past few months. All looked like ordinary broadband users. As far as I read, the tool stores content only on the local (ie user's) computer, which is little worse than ordinary cache.
It occurred to me, whilst reading their blurb, that this may be a good replacement for a certain ill-reputed search engine beginning with G... :)