At least for me, productivity requires momentum and being at a standstill feels like quite a hurdle. So at least at first, work on something you're really excited about. Something that won't feel like work. It could be a small project you couldn't otherwise really justify spending time on, but do it anyway. Visualize the end result, get yourself excited, and finish it.

Once you've gained some speed you should be able to tackle other tasks and projects. Social media will start to seem less compelling than it does now.