Ask HN: What web services should exist that haven't been developed yet?

List any top ideas that you have. It is an interesting exercise to come up with startup ideas.

Back in 2005 Fred Wilson said "Last year, when Brad and I were on the road raising our fund, we used to talk a lot about web services that should exist but don’t." http://avc.blogs.com/a_vc/2005/08/indeed.html

This exercise helped them target indeed.com as a potential investment and potentially others.

What services are missing from the internet these days?

The first thing that springs to mind for me is natural language search that really works. Along the same lines, reliable transcription.

Poo Analysis as a Service

Upload image of your poo, computer program will tell you if you have any health problems or you should change your diet.

Many people use Amazon's mechanical Turk for this. It allows you to make automated requests like this that are processed by real people. Perhaps it is not the easiest service to dive into, so I wonder if their terms of service would allow someone to make an easy to use front end that focuses on just this task.

A reddit/HN clone that customizes the content you see based off your voting history. This has been tried a few times before, but I've just never seen one take off. In fact, reddit had this feature when it started but couldn't scale it well enough so dumped it.

I feel like it would increase the quality of upvotes generally because people would know that their votes will impact the future content they see so it may slow the rate at which people up vote just to show they simply agreement and reserve it for actual high quality they we to see more of. That is just my theory, perhaps in practice it would reveal that people just care more about only seeing content they agree with anyway.