theMIX agency and RoomFullofPeople just recently announced plans to host InterPlay, a one-day event that will explore the overlap of online games and social networks that has nothing to do with that other Interplay. The conference is planned for May 22nd and will take place at the Kabuki Hotel in San Francisco.
If you happen to attend you can expect to see speakers from companies such as Bebo, DoubleFusion and Electronic Arts. Their will also be a strong showing of venture capitalists to offer their own perspectives on several subjects. The panels being offered seem like they'll vary, some of the included examples are "Micro-Transactions and Virtual Goods", "Funding the Social Gaming Sphere "and "Advertising and Marketing on Social Games".
Sounds like a fairly well-rounded event and being that it's only one day it should be full of interesting discussions for those interested in either social networks or virtual worlds.