Parse is a very powerful tool when it comes to Android development. Parse itself is a "back-end" for mobile apps, which allows you to store user information and handle user permissions without writing a single line of server code.
It also supports and abstract some features in Android that are often very hard to implement:
1. Store and link with Facebook accounts.
2. Store and link with Tweeter accounts.
3. Push Notifications.
4. Store locations.
This makes it a central part of SOLOMO.

For example, if you were to develop for Facebook:
Facebook has its tutorial at:
https://developers.facebook.com/docs/mobile/android/build/
That is rather complicated, but if we just use Parse we can store users using the simple Parse Facebook Utils: https://parse.com/docs/android_guide#fbusers