Default apps on Android
<p>Are there any default apps on Android? Especially in 4.2?</p>

<p>iOS 6 has Passbook, built-in Facebook/Twitter support, allowing for greater integration into these services.</p>

<p>Is there something similar on Android that can reliably be accessed across all devices running the latest Android OS version?</p>

<p>I know that there are Android apps that can read the Passbook file, but they're not Google products the way Passbook is an iOS product. Similarly, I know that there are Facebook and Twitter Android apps, but they may or may not be installed and may or may not respond to an Intent that's possibly structured differently between versions of those apps. Am I just doomed to deal with this fragmented space, building for the past and hoping it won't break in the future?</p>
