I can't believe you people actually use or care about Dropbox. They are signing on with the NSA to assist in eavesdropping. If they take bitcoin directly, then they'll happily pass along your bitcoin sending addresses too. SpiderOak is a better choice as the data is encrypted before it leaves your machine.
Source on Dropbox working with NSA?
Top secret PRISM documents which were leaked by a whistleblower.
Google denies their involvement and knowledge of PRISM. If he's telling the truth, that certainly lowers the credibility of the leak and increases the chances that other companies were not contacted regarding this as well.
Dear Google users
You may be aware of press reports alleging that Internet companies have joined a secret U.S. government program called PRISM to give the National Security Agency direct access to our servers. As Googles CEO and Chief Legal Officer, we wanted you to have the facts.
First, we have not joined any program that would give the U.S. governmentor any other governmentdirect access to our servers. Indeed, the U.S. government does not have direct access or a back door to the information stored in our data centers. We had not heard of a program called PRISM until yesterday.
http://googleblog.blogspot.com/2013/06/what.htmledit: Facebook denies as well.
https://www.facebook.com/zuck/posts/10100828955847631