Mssenger virus/hack help needed

Hi,

I have an important question...

The situation:

There was a Facebook messenger video that I

received from a friend that I then forwarded to approx. 20+ other friends (some

individually some in groups).

One of my friends (that was in a small group of three) says that this video was a virus/hack and took over his computer/or messenger and it "self-forwarded" itself to his entire address book.

 I have checked with all the other people I sent this to, including the others in the same small group and even the person that originally sent it to me. Not one of them had any issues with it.

 My friend is VERY mad at me and blaming me for sending him a virus/hack.

How can I prove to my friend that I DID NOT send him a virus/hack? (that the video I forwarded

did not have the virus/hack) and that it must be something else?

If you do not know know the answer, who might I contact about this?

This is VERY important

Thanking you in advance for any help

E.M.

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