> what's the most popular post on hacker news ever?
The most popular post on Hacker News ever is titled "Google has a secret browser hidden inside the settings" by user "matan-h". It has a score of 571 and 198 comments. You can read the post here.
> list profitable sideproject stories posted to hacker news
Here are some profitable side project stories that were posted on Hacker News:
Google has a secret browser hidden inside the settings - This story discusses a secret browser discovered within Google's settings, revealing interesting insights about Google's internal projects.
Show HN: Content-aware ... Arduino Uno R4 WiFi - ... Launch HN: Argonaut (YC S21) – ...
> how many post the user tiborsaas have on hacker news?
Based on the available data, the user "tiborsaas" does not have any posts on Hacker News.