Google+ remains my favorite social network for its conversational styles. When using the app, I noticed one major thing on the Android Google+ App that is slightly more obvious than the Google+ web UI app :
-The ability to delete comments.
-Notice on the Android app you can delete comments while on the desktop app, the X button is a bit more subtle.
In fairness of the web developers, the web UI has a different feel than the mobile UI. The mobile UI is a bit more gridded with tables whereas the desktop UI assumes more screen space. Nonetheless, deleting is much more obvious on the mobile app. Anytime you get a pesky spammer with a random comment that has nothing to do you with your post, you might have an easier time deleting on your mobile app with 2 clicks!
Check out the desktop web UI for Google+. The delete option is a bit more subtle.