You know, denying Facebook the standing to challenge the constitutionality of warrants on behalf of its users is a really bad precedent.
This means that the court didn't allow the constitutionality of the warrants to be considered, and instead of having the ability to have blanket protections based on "you're not allowed to do that", now it's a "serve unconstitutional warrant now and let each affected party resolve this later".
Basically this gives the government the ability to use general warrants, or otherwise specious legal arguments to claim any old damned thing ... and Facebook (and now nobody else) can say "hey, wait a minute, you can't do that".
This isn't corporations running rampant over the law, this is the law running rampant over your rights and then leaving you on the hook to fix it later. It's a shoot first and ask questions later interpretation where even if law enforcement comes in with a blatantly illegal search warrant Facebook and others can't challenge it.
This is a terrible fucking idea, especially since law enforcement has increasingly decided they don't really give a damn about the constitutionality of anything they do.
Do you want to live in a society in which the government gets to break the law first and then leave it up to individual defense lawyers to resolve that?