[nescioquid]

Not an expert, but fair use generally covers education, criticism, parody, and satire. There is a test for meeting fair use and it includes things like amount copied and commercial or non-profit interest.

The amount copied from any particular source might be small, but an aggregate strip-mining of many copyrighted sources is an interesting twist. Another might be, as you suggest, it might be a machine that itself does not violate copyright, but has the effect of causing users (who accept the suggestions) to violate copyright.

[collegeburner]

Google does the same thing taking snippets out of pages or even completely caching them so you can see the entire page from their servers.