You heard it right, search for porn with no porn results. That’s one thing the newest search engine in the town can do. Ladies and gentlemen, say hi to Blekko.
Blekko introduces us a new concept called slashtags that filters the search results and comes up with only the ones we’re interested in. For example using the slashtag /chess will show up results from only the sites associated with chess. If you want to search for porn in sites which don’t have adult content, search porn /noporn.
http://blekko.com/ws/porn+/noporn
Blekko says the sites for the built-in slashtags are carefully chosen by humans. And users can built their own slashtags too. The quality of the search results are still far behind Google, of course, but Blekko deserves giving a try.