
What is Strobing? How to Strobe and FOTD
Turns out it is highlighting the face for a luminous look. If contouring "deepens" the shadow-areas and sculpts your face, strobing accentuates the brighter areas (apples of the cheeks, brow-bones, chin, centre of the forehead...) with a fresh glow.
I usually prefer a matte look, as my face already produces enough oil to fuel a small country for a month. So I was leery of strobing at first.
Chances of my looking like
And, this is the result.