A report from Inside Facebook estimates U.S. spending on in-game "virtual goods" will grow 38%...

|By:, SA News Editor

A report from Inside Facebook estimates U.S. spending on in-game "virtual goods" will grow 38% this year, to $2.2B, and another 32% in 2012, to $2.9B. 55% of next year's spending ($1.6B) is expected to happen on Facebook, giving the company a lucrative non-advertising revenue stream (courtesy of a 30% cut). Zynga (ZNGA) games currently account for ~75% of Facebook virtual goods sales.