For now: a) The fact that they didn't appear in Snowden's documents like the other companies, b) the fact that companies like Google (and Facebook, Yahoo, Mic

For now: a) The fact that they didn't appear in Snowden's documents like the other companies, b) the fact that companies like Google (and Facebook, Yahoo, Microsoft, etc.) have it as their mission to build as precise user profiles as possible ("data hoover"), for example because the rely on advertising revenue. (Google is a 1-trick-pony, advertising being its trick.)