I have a difficult time identifying new posts, and ensuring that I'm up to date reading everything.
Many of the channels have multiple threads, but i find it very difficult to ensure that I'm up to date reading everything.
Most similar functions in Lotus notes has the ability to sort the conversation by thread or simply by date, where you can easily see the latest updates.
Reading down thru the list of updates is also very frustrating, because I find that i constantly have to click 'x replies from so and so' in order to see all replies to a topic.
It just seems that teams (and for that matter, Yammer) is difficult to navigate and ensure that you've seem everything.
Even a button that would show 'Unread Items Only' would be helpful, especially if once reading the unread item, there was a link back to the top of the thread.