If you want to filter the list of logs to show only yours or your friends logs, press the person icon at the bottom of the log list between the REFRESH and MORE buttons. This will filter the logs and display those accordingly. You create your friends list by adding them in settings or by pressing on a log and run the task to add that user to your list.
Sorry, but Groundspeak doesn't authorize 3rd party apps to directly access your friend list created on their web site. So we have to build a separate list.