The hottest application on Facebook these days is Scrabulous, based on the Hasbro boardgame. Jayant and Rajat Agarwalla, a young brother duo from Calcutta, developed an online version of Scrabble in 2005. They put it on Facebook in June in the hopes of targeting 0.01% of the website's citizenry, but now it's got over half a million daily users.
The brothers are rumoured to be earning $18,000 a month from the app, the New York Times reports. The legality of their revenue may still be in question, as Hasbro never responded when the brothers wrote over copyright concerns. But they still plug in the original: "Scrabble has a charm of its own because you’re playing with close friends or family," said Jayant.