I used Diigo sidebar to bookmark a page - created a new list - but did not find the new list in the sidebar. I had to sign out and sign in again to see the newly created list. This is buggy!!
I sent a friend request using the finder. After the friend accepts the invite, I am able to see the friend on the diigo web page. But the Diigo Sidebar still says "You don't have any friends at Diigo". Puzzling!