I understand there can be tremendous benefits in letting companies analyze all sorts of data on us, and then letting them spit back useful services for us. However, if we're going to go along with all of this, then we'd better have some very strong national and international laws to protect us against government abuses in simply lifting data of millions of people at a time, or simply targetting various people, whether nationally or internationally, without very strong oversight and a clear record of what happened, who did it, and why they did it.
Otherwise, companies like Google, by collecting so much data on us and keeping it for so long, are just making it extremely easy and trivial for governments to abuse their power.
[1] - http://www.nytimes.com/2013/10/02/technology/google-accused-...