A couple of people have pointed out my phrase &quot;non-members extracted from my address book&quot;... Perhaps this should more accurately have been &quot;possibly&quot; extracted from my address book.<p>I&#x27;m a friend of Tom, Jerry, and Spike. We all have each others&#x27; email addresses in our address books.<p>We&#x27;re all LinkedIn members apart from Spike. Tom and Jerry both upload their address books to LinkedIn, but I don&#x27;t.<p>LinkedIn doesn&#x27;t require a wizard to work out that austinjp may know non-member Spike. They simply have to display Spike in a mixed-list of members and non-members and wait for me to click him.<p>They even differentiate non-members from members, but too subtly, and all it takes is one mistaken click.