I'm no gwern, but here's how I do discovery. To find a page on the internet, you need to hand a search engine something that can be reasonably expected to be on that page. So if you want to find an interesting film blog, you should not use that as a search term, because you'll find lists of blogs, not the blogs themselves. Rather, you should probably use the titles of interesting movies.
There are many ways you could seed that search, but as totally-not-a-movie-buff I decided to check IMDb's list of lowest rated movies [1] and chose a title further down the list (The Wicker Man), on the theory that only dedicated people would be talking about movies that are bad, but not bad enough to be the worst. Searching for blogs (as identified by inurl:blog) mentioning "The Wicker Man" [2] does turn up a few promising results, like [3].
This is good advice - thankyou! I have definitely used this kind of approach before, it requires some creativity. It feels like there are possibly dozens of ways of approaching this - and obviously unlimited kinds of 'seeds' (as you say) for the search. I'm definitely looking for a guide that might encompass this kind of strategy.
There are many ways you could seed that search, but as totally-not-a-movie-buff I decided to check IMDb's list of lowest rated movies [1] and chose a title further down the list (The Wicker Man), on the theory that only dedicated people would be talking about movies that are bad, but not bad enough to be the worst. Searching for blogs (as identified by inurl:blog) mentioning "The Wicker Man" [2] does turn up a few promising results, like [3].
[1] https://m.imdb.com/chart/bottom
[2] https://duckduckgo.com/?q=inurl%3Ablog+%22The+Wicker+Man%22
[3] https://blog.vrv.co/kaiser/4826/the-wicker-man-was-almost-lo...