"The study found that 44% of people have recommended a product on Twitter, and 39% have discussed a product on Twitter. Facebook skewed a bit higher. Forty-six percent of respondents say they would talk about or recommend a product on Facebook. The economy has heightened awareness of printable coupons, which gained acceptance in social network sites in the past year. The coupons' message resonates the loudest with consumers — in fact, 32% say that's a message they listen to loud and clear. Sales and special deal notifications follow at 28%; offers to win points for online currency, 23%; and sweepstakes participation, 21%. "