The PlayStation 4 has some awesome sharing abilities, where PS4 gamers can share screenshots and videos directly to Facebook. Unfortunately, this won't be done through a dedicated Facebook app on the PS4.
Facebook engineer, Colin Creitz, when talking with Polygon, explained why Facebook will rely on built-in browsers: "One of the things that came out of our experience with the previous generation of consoles is that we found that maintaining the native apps was a relatively high maintenance burden, and didn't really lead to a high fidelity experience."
Gamers can establish their real identity using their Facebook login, with Crietz explaining: "One way you can establish your real identity is by using your Facebook login," Crietz said. "It'll bring in your Facebook profile picture and you have the opportunity to manage whether people are looking at your PSN avatar or your Facebook profile picture, [which is displayed] on a per-other user basis."