By using the Manage Views settings within the Google+ mobile application you can customize your stream viewing while on the go.
Google+ Circles “helps you organize everyone according to your real-life social connections–say, ‘family,’ ‘work friends,’ ‘music buddies,’ and ‘alumni’.” This becomes useful as your friends join, or you start following well known celebs or tech writers. Each Circle becomes it’s own stream on the Google+ website, allowing you to filter down to just the updates from the people in a specific circle. Many people don’t know that the same functionality exists on the Google+ mobile applications.