Remove Facebook from your phone.
You’ve probably heard that if you’re trying to lose weight or get healthy, you should not keep junk food in the house. Will power is depletable. That is, it will work for a certain amount of time before you will inevitably give in.
In the same vein, if you want to be productive, don’t keep time wasters so easily accessible.
Consider replacing that app with a productivity or inspiring podcast you can listen to during down times. Or install a reading app such as Kindle or Audible.
Set yourself up for success.