Elven Demons is a story based RPG game that, as of right now, it's only available on Facebook.
The reason why Elven Demons will be one of the most succesful RPG Social Games, is because it has one innovative aspect that differentiates it from most social games and makes playing it more appealing: a story element, albeit one that's a fairly minor appendage to the game.
At any given time, you are in one 'location' in the game world, with missions tied to the nature of that location. There are also secondary missions that allow you to move to a different game world location. Thus, there is a sense of change, and of exploring and learning more about the world as the game goes on.
What is the appeal of this game? Well, for one thing, you can just play for short periods once a day or so while at the office or whenever you have a minute to spare. There have been others that allow this, and it's interesting to see a genre that finally succeeds with the model. There's the pull of rising in level simply to unlock the next tranche of content. And of course, the game tells you more about the story after completing each quest, instead of making you stay in one location of the game repeating the same missions over and over until you are so tired of seeing the same graphics that you have nightmares about them.
Player interaction is, in fact, expanded in this game, compared to it's counterparts: you can not only invite your friends to play and attack other players, but you get to interact with the newcomers and help them by sending them some of your spare items and money. On the downside, you don't get to attack just anyone, but characters of approximately your power. Combat is a matter of comparing your stats, along with those of your friends (other members of your group') against those of the defender and his or her friends. This game brings a whole lot of possibilities that others didn't: you can post on your in-game wall what allies you have and will help you in case of attacks, to stop other players from stealing your gold reserves; you can maintain a vendetta against one particular player or group; you can ally; you can negotiate; you can provide money or items.
Another interesting feature that this specific game brings into the table is the ability to auction and bid on items at the "King's Auction House".
The game's story is fascinating, but a little hard to understand at first. To summarize: the main character of the story (or "you") is walking back home one night, when it's suddenly attacked by a misterious creature, which turns out to be a Demon. After struggling, you lose consciousness and wake up the next morning not remembering a thing. It turns out that the Demons is inside you, and together you start an interesting and bizarre adventure. I won't tell you the whole story, of course.
The game continually evolves into something more fascinating as you advance and move from location to location. Drawings have a medieval and almost artsy look. The mistery of the story and not knowing what will happen next make Elven Demons a must play if you like RPG games that you can play with your friends and challenge other people.
Give it a try. And if you like it, become a fan! Drop a line to the guys that made it, and continually add more chapters (one new chapter every month, according to the App page)