Well I was playing Red Alert 3 and I noticed you can invite friends via the XMB like in Resi 5. I went to view someone's profile and noticed a new button:

And when I clicked it this came up, it seems to be options for the game you are currently playing that can be used on the friends list (it says "Invite to game")

It's strange that Sony never show off features like this, and even more so that so many developers don't use this feature!
http://community.eu.playstation.com/playstationeu/board/message?board.id=62&thread.id=1418187
I never noticed that until now, pretty cool feature.











