Additionally, not all third-parties are the same.  While information sent to Pandora's sponsors may be aggregated and not linked to a phone's unique identifier (whether this is the case is not apparent), can you be sure that an independent game developer is protecting online privacy beyond his own monetary interests?  For games with millions of installs, like Angry Birds, companies pay big bucks for collated and organized user identifying data, and though Apple and Google have both encouraged app developers to maintain user privacy through privacy policies, opt-out procedures, opt-in tracking, and collecting data anonymously, apps are not required to have any of these features to be included in either marketplace.  In essence, your privacy on the Internet is protected only by the scruples of the app developer themselves.