The original HN link is opened in a new browser page/tab. The search results should remain unchanged in the previous tab. So you don't use the back button, but the previous browser tab.
>> Clicking on what I understand are tags (hashtags) in a given post has no effect.
Search for "google", go to the first result. there is a hashtag "oracle", click and the search results are filtered by that hashtags. Please post an example where its doesn't work, so that we can fix it.
The date is shown in the preview panel on the right hand side. But wa are thinking adding the time also to the result list.
We are deriving the tags from the terms and bigrams in title, text and parsed html of linked web pages. Top frequent terms per post, but only if terms are within top 65k tags per index. Stopwords are excluded.