The lizard brain adores a deadline that slips, an item that doesn't ship and most of all, busywork.
These represent safety, because if you don't challenge the status quo, you can't be made fun of, can't fail, can't be laughed at. And so the resistance looks for ways to appear busy while not actually doing anything.
I'd like to posit that for idea workers, misusing Twitter, Facebook and various forms of digital networking are the ultimate expression of procrastination. You can be busy, very busy, forever. The more you do, the longer the queue gets. The bigger your circle, the more connections are available.