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Re:Show HN: Increase your readability and productivity with ... by gman83 on Monday December 16, 2019 @03:33PM (#21806913)
What tweeting out that your product is on HN isn't exactly "manipulation"
Re:Show HN: Increase your readability and productivity with ... by dang on Monday December 16, 2019 @05:25PM (#21808070)
Asking for upvotes is against the rules:

https://news.ycombinator.com/newsguidelines.html

https://news.ycombinator.com/newsfaq.html

Soliciting booster comments is even more against the rules.