If you didn't know already you can replay and edit gameplay during the Skate 3 demo! Just press select to enter editing mode.
It does take a while to learn how to edit but it gets fun to just watch stuff in slo-mo
Here in this topic hopefully everyone who is playing Skate 3 can show us their replays.
I have one replay, it's not the best, I had better but couldn't upload them due to me being unable to connect to PSN
EDIT: So apparently you can only have one at a time and it takes several hours before they make it onto the site but you can download them