Google said its average cost per click rose 3 percent from a year ago, meaning companies paid more to place ads. People clicked on ads 16 percent more than they did in the same period last year. During a conference call with analysts, Google said sales of its display ads, which include those on YouTube, are on a pace that would translate to $2.5 billion annually. Its mobile advertising businesses are on pace to bring in $1 billion in revenue annually. The figures are the most specific Google has released about the two emerging businesses. The company, which is based in Mountain View, Calif., indicated it would keep hiring and spending. "Our core business grew very well, and our newer businesses—particularly display and mobile—continued to show significant momentum," said CEO Eric Schmidt in a statement. "Going forward, we remain committed to aggressive investment in both our people and our products as we pursue an innovation agenda." - AP and Reuters contributed to this report.