I've been looking on the game, and on my phone through the app, and all I can seem to find is ways to hack random people. I don't care about random people, though, I want to hack my friends' games.
Unfortunately Ubisoft dropped the ball on this feature. I already have a thread petition sign up for this feature to be added. Petition here: Intrusion Hacking Following Mode with Friends Sign-Up Petition LET THE SIGN-UPS CONTINUE!! LOL