Performics and ROI Research have released a study of 3,000 active social network users in the U.S. which found that while sites such as Facebook and Twitter were primarily for socializing, branding and marketing content was widely accepted. Almost half (48%) of Twitter users who saw a brand’s name mentioned on the site would go on to use a search engine to investigate further, and 44% of Twitter users have recommended a product. More stats in the Performics press release.