That case is one of a multitude that allows you to tie a person to an IP to activity based on computer ownership and ISP records with reasonable certainity. Please note, not beyond any reasonable doubt.
My contention is that if IP records bear out those posts originated from where we think they did, the judge would let the jury decide credibility.
I have case law to back my opinion. Please cite something for yours.
In your case the ip address may have tied a pc to illegal activity and it could be established who owned the pc and therefore was responsible.
But being able to establish that a particular pc or cell phone was used to send a tweet or post on Facebook doesn't establish who sent the tweet or made the post.
And hey, I'm not trying to win a case, I'm just talking about what I think is a big problem with relying on things like Facebook or Twitter, in trials in general.
Suppose I hate fruitcake. But I post on Facebook, hey grandma, thanks for the delicious fruitcake, its one of my favorite things.
Then there's a rash of fruitcake burglaries and for one reason or other I'm a suspect.
Is it proper to use what I posted on Facebook to impeach me when I say I hate fruitcake ?