When analyzing a code base you can make some educated guesses based on naming but generally you want to check those guesses by seeing how, where and why a variable is used.
If a very specific claim of down-ranking is made I expect to see a down-ranking function, short of that it's a list of names that might be used for bot detection, for manual review of the tweets, for requiring the user to add their phone number to their account, it might come along another map factors that down or up weighs those topics, I could go on...