[disclaimer I work at Blekko]<p>When visiting the RSA Conference there was a lot of talk about the additional threats of web pages which were 'bad' but not detectable bad (like social engineering web sites). The combination of algorithm + curation + user spam signals adds some depth to the defense line. Nice to see that message resonate with the NY Times too.
It didn't make it into the article, but if you use Do Not Track with Firefox blekko will turn on "SuperPrivacy" and not save <i>any</i> logs at all, or pass the query to any third parties.