Google spent $1.5 billion on advertising in 2011, Ad Age reports. The company makes 96 percent of its revenue by selling advertisements; the article doesn’t make any mention of whether or not Google was double-dipping by buying and selling its own advertisements or if the company promotes its own products for free. The former would be an interesting scenario, pumping both expenditures and revenues with no genuine cost to the company.

[Source: Ad Age]