David Hains:

Shafquat Arefeen just wanted to understand the housing market better.
 The 26-year-old financial data analyst saw that the Toronto Real Estate Board (TREB) had made aggregated data publicly available — but he wanted to develop his own insights. Using information released by TREB in early July, he published a visualization of trends in Toronto’s housing market.
 Readers loved it. His website, which does not have ads, got 13,000 visitors in the first month the visualization was available.