Here's something similar I recently created.
http://ifdefined.com/hack_week.html
It uses a collection of keywords that you choose and then uses Nokia's HERE.com APIs to create a heatmap. The fun is coming up with the keywords. "Vegetarian" and "yoga" work pretty well for finding hipster places in the US, but for India not so much. Instead I tried "coffee", "pub", "pizza". "Sushi" works internationally except you-know-where.