Just like the web version of Google+, the Android app will now show you at least some of your friends' "+1" activity in the main social stream. The new functionality (which has more than a little in common with the way Facebook does things) should allow Google+ to be even more social - you'll be able to weigh in on more of your friends' activity, or at least the activity that doesn't include full posts.
Whenever you hear someone talking about Facebook's mobile app, the most common complaint is always how slow it is. Even your news feed can take what feels like an age to load, and that's before you've started navigating through your events and photos of friends.
The reason for this is that the Facebook app uses HTML5, so it doesn't perform as well as other apps which are written natively for a particular platform.
Popular deals service Groupon has had its Android app facelifted, resulting in a new look, as well as a couple new features and services. Take a look at the brand-new UI:
As you can see, the app now looks looks decidedly more Ice Cream Sandwich-y, has added a universal share button, and swipeable categories. You'll also notice new categories for Pets and Rewards (spend enough money at certain businesses and you get loyalty rewards).