I don't really know what happened to campaign infrastructures in past presidencies. Did they just lie dormant, Waiting for the next struggle 4 years from now? I do know Obama CANNOT let this network of people lie fallow. He is the first online president. His SHOULD be the first online Presidency.
Here's an example of what I think he can do with it: let's say in the Obama DOJ, they have all our fave perps in their sights with all the evidence. But there's conservative push-back, like people don't wanna see politicians in jail blah blah...BS. BS. He can contact local youth to protest nonviolently at the offices of this or that congressman or woman to flip there vote.
If he wields this machine like knife he will make huge gains in the first four years.
There are any number of ways to not let this machine grow rusty. I'll end this with a poll