I only play mine for Metal Gear GZ & Assassins Creed IV, i play my PS3 far more often though as i have alot more games & PSN mates to play with so all good. Btw cheers for the SC fights the other night man.
Free Step Dodge
Keved
Yurlungur
you can still message people from a ps4 account to a ps3 lol
Gurimmjaw
They won't forget cause you will still see them online since it a playstation network account.
Force_of_Nature
I won't lol. I'm just using mine for AC4, MGS5, and KZ4. Though Resogun is pretty sick! And yes, I can still see who's on PS3 or PSVita 
.
.