Actually, yes, the feds are using Section 215 of the Patriot Act to get FISC orders on all metadata of Americans' domestic phone and internet communications from ISPs and phone companies. The feds are leveraging a theory that you have no privacy interest in your metadata, thus no 4th Amendment violation.

It's not clear at all that this is legal, especially given the Supreme Court's recent ruling in Jones, requiring warrants for GPS tracking of automobiles.