Google to delete search data of millions who used incognito mode

Discussion 21 hours ago:[0] (93 points, 70 comments)<p>[0]: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=39898619">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=39898619</a>

Wait, how can they selectively tell a user is in incognito?<p>That&#x27;s an interesting search&#x2F;delete, I want to know the parameter.