The use of social networking sites introduces the risk of:

Employees using social networks may post details about internal projects, client relationships, system configurations, or business strategies that constitute proprietary information. Once disclosed publicly on platforms like LinkedIn or Twitter, this information cannot be recalled and may benefit competitors or attackers. This is the primary and most direct security risk associated with employee social networking activity.

Data classification is an internal process for labeling data sensitivity and is not directly caused or disrupted by employee use of social networking sites.

Data availability refers to uptime and access to data resources; social networking does not affect whether internal data remains available to authorized users.

Chain of custody is a forensic and legal concept relating to evidence handling and is unrelated to the risks posed by social networking site usage.