Explained here: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10223645" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10223645</a><p>&gt; Second, when you&#x27;re logged in, stories on &#x2F;newest and on &#x2F;item pages have &#x27;past&#x27; and &#x27;web&#x27; links. Click on &#x27;past&#x27; to search HN for previous stories with that title. This helps with finding duplicates. Click on &#x27;web&#x27; go to a Google search for the story title. This helps with finding better sources and catching spam.