This is interesting but a more accurate title would be "New Zealand law allows corporations to sue Glassdoor for user data." As the article notes:

> statements of “pure opinion” are protected by the First Amendment in America. But New Zealand doesn’t have this. Statements of opinion are not categorically protected.

That said, the warning that Glassdoor adds to the pages of companies that do this has to be the biggest warning not to go work for these companies; definitely a bigger deal than a couple of bad reviews.