First I'd make everything on the internet freely accessible for free.
In online games I would make hacking impossible. Then I would go in and mess up the games making them more random, and distributing overpowered items to people who are nice, and I go around occasionally acting like a crazy semi-benevolent lvl 1,000,000,000,000,000,000 character.
Maybe I'd do something cool like hook a terrorist page directly to a terrorism reporting page.
And then... Well I could do something new everyday. The internet would be my... Cake which I could eat and have too, because despite all the things I'd be doing I could prevent its collapse! Maybe I the world switched to online games currencies I could even hold entire economies together!
Mwhahahaha- Er, I'm fine, really, just a throat condition.