I read it in another Guardian article at the time, but: http://www.theguardian.com/world/interactive/2013/nov/01/pri... slide #3:
"Collection directly from the servers of these US Service Providers: Microsoft, Google, Yahoo, Facebook, PalTalk, AOL, Skype, Youtube, Apple."
"directly from the servers of these US Service Providers" means "with help from these US Service Providers"