Blekko allows this. You simply browse a list of topics to find the right slashtag to use. For example, this search:
Blekko will give you the latest web published by date. You can use slashtags to create a version of Blekko that just searches in a specific area. Of, if slashtag for a topic hasn’t been created, then anyone can make their own. With the new feature called slashtags produce better results for these categories of searches. Using slashtags does a search against a set of hand-selected sites, which Blekko says eliminates spam and other irrelevant material.
Further, the site has what it calls a, ‘web search bill of rights,’ which states:
- Search shall be open
- Search results shall involve people
- Ranking data shall not be kept secret
- Web data shall be readily available
- There is no one-size-fits-all for search
- Advanced search shall be accessible
- Search engine tools shall be open to all
- Search and community go hand-in-hand
- Spam does not belong in search results
- Privacy of searchers shall not be violated
Sorry the video is in Malay.