Which SSAE 16 report is purposefully designed for public release (for instance, to be posted on a company's website)?

SOC 1 reports focus on controls relevant to a user entity's financial reporting and are restricted in distribution, typically for auditors and management.

SOC 2, Type 1 reports focus on controls relevant to security, availability, processing integrity, confidentiality, and privacy at a specific point in time, and are restricted in distribution.

SOC 2, Type 2 reports focus on controls relevant to security, availability, processing integrity, confidentiality, and privacy over a period of time, and are also restricted in distribution.

A SOC 3 report is a general-use report that provides a high-level summary of a service organization's system and the suitability of the design and operating effectiveness of its controls. Unlike SOC 1 and SOC 2 reports, SOC 3 reports do not contain detailed control information, making them suitable for public disclosure and general audiences.