Social networking sites’ impact on business is growing.

Social networking sites’ impact on business is growing. This year, 68% have become a fan or friend of a product, service, company, or group on a social networking site, compared with 57% last year, the study said.

Social Media Up 230% Since 2007 . 43% visit multiple times per day. The love affair between Internet-connected Americans and social networks continues, with two-thirds claiming to visit sites such as Facebook, Twitter, and MySpace, up about 230% from the 20% penetration in 2007, and 43% are visiting these sites more than once a day, according to a new report by Experian Simmons.

People primarily logon to stay in touch with friends, followed by for fun and to communicate with family, according to the study. Career- and job-related reasons were low on the list: 19% said they used the sites to keep in touch with professional contacts; 9% wanted to make new professional contacts; 6% sought professional development; and 5% said it was part of their job, the report found.

Social networking sites’ impact on business is growing. This year, 68% have become a fan or friend of a product, service, company, or group on a social networking site, compared with 57% last year, the study said.