Zynga social gaming is seeking to raise about $250 million

San Francisco-based social-gaming company, Zynga is seeking to raise about $250 million in new funding. Zynga has already raised $360 million from a range of venture capital and other investment firms. The company is in talks with at least one bank about raising financing as well as mutual funds and others. The deal may value the company between $7-9 billion.

Last summer, Japanese telecom and media company Softbank invested $150 million in the startup. Before that, in December 2009, Zynga had closed a $180 million round from Digital Sky Technologies (DST).

Zynga is widely considered the most successful developer on the Facebook platform, with four titles to its name in the top ten: Cityville, FarmVille, Texas HoldEm Poker and FrontierVille. CityVille alone draws 96.3 million monthly active users. In total, the company serves 275 million monthly active users.