Waltham, Mass.—While most small-business owners expect revenue to increase this year versus 2011, they remain concerned about finding new customers and fret about integrating social media into their marketing, according to a study by marketing tech company Constant Contact. According to the company's “Spring 2012 Small Business Pulse Survey,” 76% of survey respondents said attracting new customers is their greatest concern, followed by better engaging with existing customers (49%) and gaining referrals (41%). Most small-business owners felt social media is the channel they need most help with. Those small businesses involved in social media were most active on Facebook (75%), LinkedIn (10%) and Twitter (7%). Constant Contact's study was based on an online survey conducted in May of 1,000 members of the company's Small Biz Council research panel.