Come to think of it maybe I should delete Tweetbot from my phone for a while. It feels about time.
Coming at it from the other end, I find that the "Pomodoro Technique"  of timeboxing works pretty well to keep me on task, when I go through the whole ceremony of picking up the cute ladybug-shaped kitchen timer I've modified by painting out anything beyond 25min, giving it a twist, and having that kinesthetic memory plus the soft ticking reminding me that I have A Thing I Have Promised Myself I Will Work On For This Block Of Time.
I haven't been doing that much lately either. I should start doing it again.