Google regains US search market share for the first time since the Yahoo/Bing alliance. Facebook ad CPCs increase 54% in Q3 due to rising competition. Facebook ad spend increases 25% as advertisers see value in social media marketing. Tablets capture 77% of retail mobile ad spend in September 2011, with mobile spend projected to be 7-10% of total paid search spend by end of Q4 2011. UK search spend and ROI both increase 16% and 18% respectively in Q3.