NB: I
really like the follow-up question concept, though I'd like to see what you have in mind for that. Usually that's something I accomplish by adding or removing terms / conditions to my query. That's often useful, but frequently not, and remove
classes of results (e.g., commerce sites, social media, SEO / content farms) is often a frustration. Poorly-detected date ranges would be another.
User-definable ranking and exclusion criteria would be great.
In the past few weeks on HN we've seen articles on:
- How universally reviled autoplay video is. Excluding sites which do this from SERPs would be a strong incentive.
- Paywalls and privacy invasions, similarly.
- Known SEO-baiting sites, e.g., Pinterest and Quora.
- Excessive JS.
- User-hostile designs.
Simple site quality and reputation would be a huge factor for me. I've increasingly taken to searching specific sites rather than general Web search just to be able to cut through the crap.
Suggesting filters to apply might also be of interest --- say, "X filter returns / removes Y results".
As noted in an earlier comment: establishing a self-indexing search standard, which would allow websites to create their own indices, and for those to be distributed to multiple search platforms. (Yes, cheats would need to be identified, and mechanisms for establishing reputation determined.)
Better metadata search, and inclusion / exclusion by category, would be great. Search exclusive to scientific, technical, or academic sites, or exclusive of commercial, paywall, erotic, gaming sites, for example. (Such filters could of course be reversed if that was your kink.) Inclusion/exclusion of social media is probably another big one.
Tools for leveraging site-specific search more cleanly, inspired by DDG's Bang! searches, might also be interesting.
Really good date-ranged search. Google still beats DDG at this, though DDG can at least filter by past day/week/month/year, which is useful.
Search inclusive of the Internet Archive's Web and other holdings would also be great. A search not just of Web space but of Web time.
A true news / magazine archive search.
Governmetnt records searches.