Not being on the front page of google or app stores is a filter. Having an etiquette guide and having your noobie comments hidden by veteran users is a filter.

Not being on the front page of google or app stores is a filter. Having an etiquette guide and having your noobie comments hidden by veteran users is a filter. Having an older style interface that puts off mainstream users is a filter. You come to HN for a reason, don't you? All the topics on HN could be on topic for /r/technology, but we are here instead. Look up a subreddit that relates to book genres. 95% of it will be identically worded recommendation threads and all of them will have the same books mentioned by responders, in an endless loop, forever. The askers are tourists who will never return or contribute meaningfully. That's what it looks like to have no filter.