Facebook is phasing out its Reviews systemin favor of a new Recommendations system. The change appears to be a staged roll-out from Facebook.
As of today, not all logged in Facebook users are seeing the new Recommend option. Recommendations are not appearing yet on public business pages to non-logged in users. Those pages still show the Reviews tab and content.
Recommendations are not yet being exposed via Facebook’s API, so it will be some time before changes are reflected there.