I set up a subreddit and linked to it on the sheet, so that people could collect their findings and discuss them together. This aspect was ultimately unsuccessful, but it was an interesting experiment in crowdsourcing journalistic research, and can likely be replicated in the future. Using a database such as via mySQL in the future would likely speed up the processing power of the tool, however Tableau made creating the whole tool - including interactive graphs - a job that took only a few hours, and could therefore quickly respond to the public interest.
You can view the tool here.