Hello Stas,
I was unfamiliar with Googles FusionTables. Studied it for a while and it seems they focus on producing visualizations on the web. The Wolfram Language is very good at this. It is also easy to embed you code in any website. btw via WL it is easy to address the Table Fusion APIs.
My questions would be why would you use FusionTables if you can produce the visualization with the wolfram language and use the cloud to publish or embed them.