ACLU's Washington Legislative Office Director Laura Murphy and Legislative Counsel Michelle Richardson wrote an op-ed in Politico about the NSA using the Patriot Act to access metadata from phone records of the American people.  Regarding metadata, they write:

These records reflect who you know, what you do, and where you go. Furthermore, if metadata wasn’t incredibly rich and revealing, the government wouldn’t be collecting them at a breakneck pace. As mathematician and former Sun Microsystems engineer Susan Landau told the New Yorker’s Jane Mayer, metadata is “much more intrusive than content.”

Read the rest.