I've had looked into Shiny apps for my own ggplot2 work, but after seeing the usage in this post, I'll definitely give it another look!

What initially kept me away was the amount of idiosyncratic code required for the server/UI without many tutorials, which made compatibility annoying. Looking at the code in the GitHub, the code still seems pretty difficult. That, and http://www.shinyapps.io/ (which the OP is using) is very ambigious in their pricing on how "Active Hours" work, which is a valid concern when a post hits the front page of Hacker News.