Maybe we should write a Screengrab do's and don'ts list.
E.g
Do
Get close to the screen or use the zoom.
Show detail so that the computer screen is more than 100% of the viewing area.
Use a tripod or a stable rest for the camera.
Explain the point of the shooting before hand to any ####istant.
Rehearse 1 time.
Post in a format the audience can access.
Don't
have the computer screen < 100% of the viewing area.
Shake the camera.
Show bright lights in the background or use a flash.
Shoot from the back of a crowd.
Any more?
Valan