I found this enlightening and quite helpful. Hopefully you will too.
Who Has Your Back? 2013
by Marcia Hofmann, eff.org -- April 30, 2013
[...]
In this annual report, the Electronic Frontier Foundation examined the policies of major Internet companies -- including ISPs, email providers, cloud storage providers, location-based services, blogging platforms, and social networking sites -- to assess whether they publicly commit to standing with users when the government seeks access to user data. The purpose of this report is to incentivize companies to be transparent about how data flows to the government and encourage them to take a stand for user privacy whenever it is possible to do so.
[...]
Who Has Your Back? 2012
The 2013 EFF Report:
2013 Who Has Your Back: Which Companies Help Protect Your Data from the Government? The Electronic Frontier Foundation’s Third Annual Report on Online (pdf)
A publication of the Electronic Frontier Foundation, 2013
Authors: Nate Cardozo, Cindy Cohn, Parker Higgins, Marcia Hofmann, Rainey Reitman
Design assistance: Hugh D’Andrade
Service Providers’ Privacy and Transparency Practices Regarding Government Access to User Data is licensed under a Creative Commons Attribution 3.0 Unported License.
[...]
For the 2013 report, we used the following six criteria to assess company practices and
policies:
1. Require a warrant for content of communications. In this new category, companies earn recognition if they require the government to obtain a warrant supported by probable cause before they will hand over the content of user communications. This policy ensures that private messages stored by online services like Facebook, Google, and Twitter are treated consistently with the protections of the Fourth Amendment.
2. Tell users about government data requests. To earn a star in this category, Internet companies must promise to tell users when the government seeks their data unless prohibited by law. This gives users a chance to defend themselves against overreaching government demands for their data.
3. Publish transparency reports. We award companies a star in this category if they publish statistics on how often they provide user data to the government.
4. Publish law enforcement guidelines. Companies get a star in this category if they make public policies or guidelines they have explaining how they respond to data demands from the government, such as guides for law enforcement.
5. Fight for users’ privacy rights in courts. To earn recognition in this category, companies must have a public record of resisting overbroad government demands for access to user content in court.[1]
6. Fight for users’ privacy in Congress. Internet companies earn a star in this category if they support efforts to modernize electronic privacy laws to defend users in the digital age by joining the Digital Due Process Coalition.
[...]
And the Service Providers winners are ...
Who Has Your Back? in 2013 ... when it comes to 'Providing Service' that attempt to protect our Constitutional Rights at citizens:
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Here is that EFF Trust-worthiness recap (in terms of 'gold stars'):
Amazon 2 stars
Apple 1 star
AT&T 1 star
Comcast 2 stars
Dropbox 5 stars
Facebook 3 stars
Foursquare 4 stars
Google 5 stars
Linked In 5 stars
Microsoft 4 stars
Myspace 3 stars
Sonic.net 6 stars
Spideroak 5 stars
Twitter 6 stars
Tumblr 3 stars
Verizon 0 stars
Wordpress 4 stars
Yahoo 1 star
And here's the recap re-sorted from least Trust-worthy to most:
Verizon 0 stars
Apple 1 star
AT&T 1 star
Yahoo 1 star
Amazon 2 stars
Comcast 2 stars
Facebook 3 stars
Myspace 3 stars
Tumblr 3 stars
Foursquare 4 stars
Microsoft 4 stars
Wordpress 4 stars
Dropbox 5 stars
Google 5 stars
Linked In 5 stars
Spideroak 5 stars
Sonic.net 6 stars
Twitter 6 stars
Enjoy! Use wisely. Before "they" use you ...