Yes, it doesn't matter which device you're on, it's all to do with your PSN account rather than the console.
No PS3 only
I would suppose so, because the fact that you can download psvita content. Other than that I'm not sure of.
Your trophies are recorded on your PSN profile, which you will log into on both your PS3 and your PSVita. On the PSVita you've got the option to just see the local trophies, the PSVita ones, but also the option to check your PSN account, which will show your PS3 trophies too.
No only for PS3, PSP and PSVita.
No its exclusive foir the PS3, PSP, and the PSvita
Yes, you can get them from the PSN.
nope sorry bro :P
There are procedures that are described in the PS3 when you try to add friends and involve sending a message to someone
You can Remote Play both the PS3 and the PS4 version, meaning the console is the one running the game, with the PSVita being used as the controller and the screen. But there is no actual PSVita version of the game.
It's PS2, PS3 and PSVita only.
yes but it also will work with the PSVita like the PS3 does
Technically yes you can. Your PSN account is a Sony-wide service regardless of the device you are using it on. You can redeem a PS3 code while on the PSVita's own PSN 'app', and it will be added to your PSN account. However of course, that will not let you use the PS3 content on the PSVita.