After I unfollowed all the irritations, I too found myself simply irritated with my facebook feed. I started asking myself, "Did this experience make my life better in some way?". After a few uses, I determined quite quickly that my life was indeed not better with it.
I haven't deleted my account, but I did remove it from my phone because it started aggressively notifying me of bogus status updates after it noticed my absence.
After a few days, I asked myself, "Is my life better without it?" Yes, no irritations from ego, politics or ignorance anymore.