"The right of the people to be secure in their [...] papers [...] against unreasonable searches and seizures, shall not be violated"
Why should the amendment protect papers if it is only the physical page that is protected and not the actual information?
It is more of a question of what is reasonable -- does a person know who has access to their information? Do they put their information out there with the understanding that it isn't private? The very basic idea here is that people should know what rights and privacies they have, and violating the conditions where they can reasonably expect privacy should be illegal.
Yes, the passing of "information" is not new. But I believe the intercepting of mail, copying and then letting the original letter through to its destination without a warrant is illegal. (Isn't it?)
I'm no scholar of Revolutionary era America, but I'm pretty sure that if shit of that sort were going down, it would have gotten specific mention in the Declaration.
If you associate with someone that runs afoul of the law, why is it unreasonable to consider you? You seem to think the only possible outcome of actually examining your shit is incrimination. It cuts both ways, you know. You could be ruled out.