[Mears]

“media” is plural therefore “are.

medium is the singular.

.

[LouieFisk]

“media” is plural therefore “are.
medium is the singular.
==
Yeah, for some reason it’s been a difficult rule for me to remember - I think because most people seem to tend to use the singular in most cases.

[Borges]

It’s come to be used as a single entity as in the Intelligentsia.