Employees’ use of social-networking sites is challenging corporate legal departments when they have to engage in electronic discovery preservation and collections — and when they seek to monitor and control corporate communications.

Here’s one of many frightening scenarios: An employee at lunch, sitting among hundreds of other workers in the corporation’s cafeteria, uses a company-owned “smart phone” connected to the company’s wireless network to tweet on Twitter, commenting on a recent departmental meeting. People’s names may be used. Opinions expressed. Confidential information shared. Potential nightmare created.