My conclusion is that HN's default search results are not very good for checking if something has already been submitted. Searching for "twitter" doesn't show any of these submissions, presumably because the default search shows only "popular" submissions.
HN should really implement something like stack exchange where it auto-searches for potential dupes
3 comments
[ 4.5 ms ] story [ 16.5 ms ] threadhttps://news.ycombinator.com/item?id=23347792 : Marked as dupe
https://news.ycombinator.com/item?id=23347415 : Marked as dupe
https://news.ycombinator.com/item?id=23347155 : 564 comments
Edit: now 582 comments and still climbing ...
Edit2: Running at about one new comment every 20 seconds, and 7 points every 4 minutes.
HN should really implement something like stack exchange where it auto-searches for potential dupes
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
Having said which, the last of them is still on the Front Page.