US advertising spending increased 0.9% year-over-year in Q2 to reach $34.4 billion, slowing from Q1′s 2.9% year-over-year increase, according to September 2012 figures from Kantar Media. For the first half of the year, expenditures increased by 1.9% to $67.1 billion. (Online spending estimates only include display advertising). Spending among the 10 largest advertisers in Q2 stood at $3.58 billion, representing a 5.5% decrease compared to the previous year. Procter & Gamble maintained its top-ranked position, though its spending dropped by 13.2%. Among other top 10 advertisers, General Motor’s expenditures fell by 30.1% year-over-year, while Unilever and Toyota Motor Corp both increased spending significantly, by 48.6% and 22.7%, respectively. Read the rest at MarketingCharts.