Android and iOS users have long been using their Facebook account for single click logging in to apps, and soon Windows 8 and Windows Phone users will be able to do the same. While the feature's is still in its early stages (on WP8, it's still in beta) Microsoft has announced that Foursquare, Adobe (Revel, Photoshop Express) and iHeartRadio are the first to get in on the action. Similar to Facebook Login on other platforms, using it will make it easier to share content from within the app, and connect your account info without punching in the credentials yet again. Foursquare will post your check-ins, the Adobe apps will let you upload photos easily, and you can share the station you're listening to on iHeartRadio. Facebook users will probably want to keep an eye on their privacy settings to avoid oversharing, while holdouts from the social network can remain assured that Microsoft's own account system is still positioned as the primary way to log in on the platform.