[DigitalJack]

You, or whomever did the screencap, must have a retina macbook. That dialog in the screencap looks huge on my computer.

[sk5t]

Since we're OT, "whom" only works in objective case.

[hythloday]

Which is to say, where you'd say him or her, rather than he or she.

"He, or whoever took that screenshot..." "Her, or whomever that screenshot was sent to..."