Employees use social networking to network with other professionals and interact with clients, but for some firms, granting access also requires the need to archive employee activity to meet requests from regulator scrutiny. Portland, Ore.-based data archival firm Smarsh conducted a survey of more than 280 C-level management employees, compliance officers and staff members at financial services firms to identify data retention and protection trends. The firm found that most respondents had archiving systems in place for email. But, while most had policies governing the use of LinkedIn, Twitter and Facebook, far fewer companies had an archival system in place to support them. The firm's survey identified the social network most frequently requested by employees and the message types frequently scrutinized by regulators. Here's a look at the survey's key findings.