How can you tell that that's an official facebook page, and not a joe-random-fan-of-facebook page? It looks like any other individual or entity page. I run in

How can you tell that that's an official facebook page, and not a joe-random-fan-of-facebook page? It looks like any other individual or entity page. I run in to this, for example, when I want to be a fan of a band or some other entity. Which of those is the entity's page and which are merely other fans?