Los Angeles-based Rubicon Project is reporting today that there was a 25 percent, year-over-year growth in online ad spending, according to the firm's Q1 2010 Online Advertising Market Report. The firm, which has been analyzing Internet advertising trends every quarter based on online publishers using its Internet advertising optimization service, said it expects 2010 to be "strong for revenue growth" in the advertising industry. Rubicon is venture backed by Clearstone Venture Partners, Mayfield Fund, IDG Ventures and GE/NBC Universal's Peacock Equity Fund.