Enter WhatApp (https://whatapp.org), a wiki page where you can rate and read reviews of Web and social network applications, browsers, add-ons and mobile platforms - reviews that will not tell you if an app is cool or not, but will tell you how secure, private and open it is.
The WhatApp wiki is the brainchild of Stanford's Center for Internet and Society academics and is funded by the Rose Foundation, which supports different projects that - among other things - promote consumer protection and civic participation.
In the teams' own words: "We want WhatApp to be a useful tool for both savvy Internet experts and novices to pool resources and share insights about the privacy features of a wide variety of applications, including Facebook and iPhone Apps, office suites, online maps, toolbars, and media players. The project’s aim is to fill the current market gap between consumer demand for privacy friendly applications and anti-privacy practices employed by the developers and thereby to foster better privacy practices Net-wide."
The page is actually quite simple and easily navigable and usable - search for the app you want to check out or browse the list of already reviewed apps:
Currently, the Featured App is BugMeNot, a service that allows you to bypass compulsory registration to various sites and services by offering bogus data. RockYou Live is in the Penalty Box, for getting hacked and revealing (unencrypted) user data.