Doesn't the warrant requirement just apply to law enforcement?
Why can't a defense attorney get a subpoena for the video?
Why can't a defense attorney get a subpoena for the video?
If you know the video is available on their Facebook account, then you know they have access to it.
My apologies for the remark about a lawyer clearing it up, I've deleted it from the above comment.
In short, you can do that. But in real life, you typically won't get the data. That's why police and prosecutor bust down your door instead of mailing you a subpoena asking you to bring incriminating evidence to the police station.