Tetris itself is a game which for example, I once played as a downloadable application called TetriNET, but I think on Facebook it gained practicality for server and maintenance purposes, and really developed the online Tetris scene from being decentralized and obscure, to having a reliable form of creating multiplayer games. JJ2 is about as popular as TetriNET 2 used to be, so what I mean is that moving to Facebook could expand the game's popularity. Naturally, every game is different, especially in terms of bugs and lags.