It's the #1 source for NSA reporting, eclipsing even their bulk cable wiretaps. They can hit a button and get Google Takeout, but for all major US online services, for anyone they choose, no warrant required.
These sorts of headlines pretend that their "normal" way of spying does require warrants. It absolutely does not.
A lot of people seem to still carry the misconception that the FISA orders (again, not warrants, no probable cause, issued by a classified court (also run by US military intelligence) that never denies a request) are only for foreigners ("foreign" is right in the name). That's also not true: they use it to target US citizens too.
This specific circumstance was cited by Ed Snowden as one of the main reasons he came forward and told everyone that this was happening.
https://www.eff.org/702-spying
The participants in this system as of 2013: Microsoft, Yahoo, Google, Facebook, PalTalk, YouTube, Skype, AOL, Apple.
https://www.theguardian.com/world/interactive/2013/nov/01/pr...