I live in Alberta, Canada. The Personal Information Protection Act governs the use of personal information by the private sector. Companies are allowed to give references when asked, but I believe public posts such as these would be illegal under the act.

Even giving references can be an issue. The law states that the company must make an effort to make sure the information is accurate and complete. For subjective measurements, there may be argument over what is accurate. When my father was working, their lawyers recommended they not give any information other than confirming employment dates and duties for references.