Dear internets you is making a mistake
"media" are the plural of "medium" so the phrases "media has" and "media is" is errors.
Google tell me that "media has" appear about 1,800,000 time in the internets
and "media is" appear about 8,100,000 time so together
"media has" and "media is" appears about 9,900,000 times.
I knows that these is just two datum, but I worry about the interenets understanding of basic grammers.
I have no opinion as to whether "MSM" is singular or plural but I feel as if I have personally read it 9,900,001 times and just seeing the acronym makes me feel as if I just ate a kilogram of MSG.