Los Angeles-based Rubicon Project, a venture backed provider of online advertising optimization services, said today that it has acquired Others Online, a provider of a behavioral targeting service for the online advertising industry. Financial terms of the acquisition were not disclosed. Rubicon said the buy will help it build out its platform. Jordan Mitchell, CEO and Founder of Others Online, becomes Vice President of Data Intelligence for Rubicon Project. Rubicon is venture backed by Clearstone, IDG, Mayfield, and others.