If "yes", what do you think of it?
If "no", why not?
If you had no idea there was one, and you have a PSN ID, I [i]highly[/i] suggest you download it. It's nigh-perfection. It like having an Xbox Dashboard on your smart phone, for Playstation 4. I wish Xbox had one, honestly.
You can send and receive messages, invites, and friend requests from anywhere you have internet connection. You can also remotely turn on your PS4.
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All they need to do is add in the play station store into the app instead if making you redirect to your browser. That's the only issue, well that and messaging is really weird on the app