Mashable provides a good article written by Ravi Mehta, VP of Product at Viximo. The article examines why social gaming is more than a passing fad. From the article:
Social gaming is here to stay, and it’s here to stay for two fundamental reasons: 1.) The format of social games is a perfect match to the daily pattern and rhythm of how people use the social web, and 2.) Social games are the only form of interactive entertainment that are natively woven into and distributed via social networks — the Internet()’s new gateway.