[macNchz]

Not sure where the data for the article came from, but I'd guess that there is some interesting socioeconomic skewing around the type of business and whether it can be readily found on Google maps or Yelp, since much of the data is crowdsourced.

[sfloy]

True... the data came from Google Maps API and so maybe be a little incomplete compared to what's actually on the street at this moment