There have been a number of people asking about this. According to Jason it was available at first but caused some issues. The latest activity button is what is currently available but is a stop gap until the latest posts issue can be sorted out. If you click on latest activity I suggest, if you can, right click on each link you want to look at and open it in a new tab. After looking at each of these new tabs close them to move to the next one or finally back to the latest activity page. This avoids the reloading of the latest activity page each time you return to it.
Martin C