I have no major objections to this paper aside from a few typos and a couple of issues.

E.g.: "merely presents it is a more useful form": Change is to "in"

An issue that I can see coming up is related to this sentence: "Gathering the photos would have taken up a lot of hard drive space but could be done in a future scraping". You should mention possible legal problems arising from releasing users photo.

Also you should update this sentence: "Presenting the data at city-level would however take too much space because there are 8,570 different cities in the dataset". As there are no city-level data in the updated dataset, you cannot present it in the paper (or else you'd violate the open sharing philosophy that you're embracing and revert to the old system). Instead, state the real reason why you cannot present the data at city-level, that is it had to be removed from the data file due to legal issues related to privacy laws.

I didn't see the new data file but I suppose it still has the country-level info, otherwise it'd not make sense to publish table 1.